Malicious PDF — malware analysis report

Static analysis result for SHA-256 4de55168a784d8f1…

MALICIOUS

PDF

114.8 KB Created: 2021-05-21 05:53:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 90293d4a41e4a900f12b6277a50c7d3d SHA-1: b6752c64869fc411fa7ad48fc753b02f4a26407a SHA-256: 4de55168a784d8f1170397c87434c43697f8a832975e028ac5dd56f7f18cc697
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document exhibits multiple indicators of malicious intent, including a high ML classifier score and ClamAV detection as a phishing trojan. The document body, though heavily obfuscated, contains text suggesting a lure for a "Winrar password remover", and the presence of a large number of external links, many pointing to PDF files, indicates a link farm or redirection mechanism. The primary malicious URL identified is https://leonvi.ru/strik?utm_term=winrar+password+remover+%25D8%25AF%25D8%25A7%25D9%2586%25D9%2584%25D9%2588%25D8%25AF+%25D9%2586%25D8%25B1%25D9%2585+%25D8%25A7%25D9%2581%25D8%25B2%25D8%25A7%25D8%25B1, which is likely used to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://leonvi.ru/strik?utm_term=winrar+password+remover+%25D8%25AF%25D8%25A7%25D9%2586%25D9%2584%25D9%2588%25D8%25AF+%25D9%2586%25D8%25B1%25D9%2585+%25D8%25A7%25D9%2581%25D8%25B2%25D8%25A7%25D8%25B1 PDF link annotation
    • https://kuvitarige.weebly.com/uploads/1/3/4/0/134095916/fodibapisum.pdfIn PDF document text
    • https://nawawuxilebop.weebly.com/uploads/1/3/4/6/134679594/52f3a0456646e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367283/normal_5fd677e8cc9b6.pdfIn PDF document text
    • https://bopilewe.weebly.com/uploads/1/3/4/5/134523270/guzilijononibigomaw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408471/normal_5ffa6a17cc49a.pdfIn PDF document text
    • https://wumigativagulam.weebly.com/uploads/1/3/1/6/131637174/majew-pesigexutup-mekasatabo-dekixus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372735/normal_60242926cddbd.pdfIn PDF document text
    • https://kodalisurodufe.weebly.com/uploads/1/3/2/6/132680932/zikowawiseg-fiwesiva-makaxozura.pdfIn PDF document text
    • https://zorikibezoxima.weebly.com/uploads/1/3/1/3/131384208/589296.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492240/normal_6004bf5dab675.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447915/normal_6038428bca753.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/likadojivivofu/catholic_mass_for_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/pegozegi/38840018922.pdfIn PDF document text
    • https://s3.amazonaws.com/dukajevo/payment_authorization_letter_template.pdfIn PDF document text
    • https://s3.amazonaws.com/loxopudizus/ligimetewamadifuras.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f4d2de0-81a3-449e-9c04-10e7cf463a3a/html_sinhala_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc563356-1e81-4a67-85e8-c9528aa9f5ee/7909445026.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad8c256f-319c-4b84-8dd8-7c1c234d0f16/42099704758.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abc35784-77b3-48a0-bbf1-776152686061/jafibetewibimejedefabirow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/102ccd11-9345-46d6-b8ba-4af6ae414d71/samsung_t230nu_hard_reset.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6d65666-8f01-4e9e-bdd4-216ea0d18d20/the_natural_rate_of_unemployment_equals_the_sum_of_the.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2169c7cf-952e-4da7-99f5-94d3de083705/40521216689.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxenipup/5758300101.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54d5e146-1c74-4075-a2fa-99646f50a46a/how_to_be_a_better_finish_carpenter.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001729d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1729D 32048 bytes
SHA-256: f051cc16df20c45048c8281cca103befb24e2ae99fe22d4d52e378f709befb80
font_00_sfnt_off000125b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B7 4944 bytes
SHA-256: a600d85b75b9e2cc3c2063173344df481504b121005e8d079cb8722586f3848e
font_01_sfnt_off00013672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13672 10292 bytes
SHA-256: 8e8e8093529c7e5fe5d6e61154863ff02238192690f7d77c975399734ea8aebe
font_02_sfnt_off000159fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159FA 17108 bytes
SHA-256: 1d78e5294f036a266d12175ad70c217d9b0807da8ca1b2b6f646eadadd719fcc
font_04_sfnt_off0001abd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ABD9 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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