Malicious PDF — malware analysis report

Static analysis result for SHA-256 a05ad74cae87d1d2…

MALICIOUS

PDF

80.4 KB Created: 2021-05-20 17:52:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 4bfba1242324b18aa074a14cc5abc421 SHA-1: 80d496331861d935f27d018c598f796a7e3e5b49 SHA-256: a05ad74cae87d1d2734db130f9cd899d8b549773ee302c0e0acee4d9f97308a6
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to PDF files hosted on various domains, indicating a link farm or redirection scheme. The primary URL suggests a lure related to mathematical equations, likely to attract unsuspecting users. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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://pelibifir.ru/strik?utm_term=how+to+write+an+equation+in+slope+intercept+form+of+the+line+that+passes+through+the+given+points PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454429/normal_605861801542c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420927/normal_6062752be53e8.pdfIn PDF document text
    • https://ruvawigalovenu.weebly.com/uploads/1/3/4/3/134318686/7092246.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455396/normal_5feb5481c4e25.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408594/normal_5fdd84ecd7c5b.pdfIn PDF document text
    • https://disemorabegelam.weebly.com/uploads/1/3/1/3/131383982/bosebalaludefu-tulawinopobapi.pdfIn PDF document text
    • https://rozenawaxu.weebly.com/uploads/1/3/4/5/134517597/a4e9adb8b5.pdfIn PDF document text
    • https://vufegolafo.weebly.com/uploads/1/3/0/9/130969987/fc5414.pdfIn PDF document text
    • https://ginataxidorivez.weebly.com/uploads/1/3/4/0/134041929/7553322.pdfIn PDF document text
    • https://migapivali.weebly.com/uploads/1/3/1/3/131381101/88398d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366358/normal_6052332c93cd0.pdfIn PDF document text
    • https://kiwakobomu.weebly.com/uploads/1/3/1/4/131482833/nifepo-tazoza-limajexakimo-luzadugenux.pdfIn PDF document text
    • https://sozazoje.weebly.com/uploads/1/3/1/1/131164180/6244976.pdfIn PDF document text
    • https://mepagalupotope.weebly.com/uploads/1/3/4/2/134265457/lemosorave.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494431/normal_606b3385ed5d1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374848/normal_6001a1d1031dc.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/jawusawar/how_do_you_address_a_letter_to_northern_ireland.pdfIn PDF document text
    • https://s3.amazonaws.com/banula/how_much_oil_does_a_snowblower_use.pdfIn PDF document text
    • https://s3.amazonaws.com/farokof/rasepuxudotisuti.pdfIn PDF document text
    • https://s3.amazonaws.com/rafiralexezol/sigurejonadafumareto.pdfIn PDF document text
    • https://s3.amazonaws.com/kavifunaruvi/adverbs_exercises_for_grade_7.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB68 5552 bytes
SHA-256: 37ef3eb5081ad7c9651a7defc38e9b2c63b68428743ad744953c95a0bb99c537
font_01_sfnt_off0000fe31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE31 11352 bytes
SHA-256: 9476f6fa4be4d07b3249693c2c8853e3099cfff47e1dd9e150bc936b76681ad4
font_02_sfnt_off000124c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C9 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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