Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf6b050e50d9ac5c…

MALICIOUS

PDF

82.8 KB Created: 2021-03-31 07:52:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: a48e6b427ad5cd60443ad3cbf9b2a96b SHA-1: cd08fe07caed6f61e17b33e1fc30fcc670faa7ae SHA-256: cf6b050e50d9ac5c05409a14b3490d6c7a479f83f94688dbaac89ab88f74e112
126 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate a high probability of maliciousness. It contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The document body, though partially corrupted, includes a keyword related to a search query, reinforcing the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://lozipotod.ru/award?keyword=history+of+computer+keyboard+pdf PDF link annotation
    • https://fidurelofomus.weebly.com/uploads/1/3/0/7/130740547/9169195.pdfIn PDF document text
    • https://ramowofotaro.weebly.com/uploads/1/3/1/6/131607053/6177c27611.pdfIn PDF document text
    • https://wuvotawek.weebly.com/uploads/1/3/4/8/134872633/xulipig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444117/normal_600e4423816db.pdfIn PDF document text
    • http://littlenat.space/coin_master_free_spins_android5w63a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379370/normal_5fdab624032a8.pdfIn PDF document text
    • http://worldhold.online/919914378198vfm.pdfIn PDF document text
    • https://jawutasujo.weebly.com/uploads/1/3/0/9/130969833/d4890468e2.pdfIn PDF document text
    • https://kivobuduzuv.weebly.com/uploads/1/3/0/7/130739084/8626649.pdfIn PDF document text
    • https://jutoxanifi.weebly.com/uploads/1/3/5/3/135321179/gemubukoraxoxe.pdfIn PDF document text
    • http://italia-doc.space/misty_ella_fitzgerald_sheet_music_freey3q2w.pdfIn PDF document text
    • http://50offshop.pro/let_us_c_yashwant_kanetkar_solutions0not8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481673/normal_6034cd52b7169.pdfIn PDF document text
    • https://dirututusobed.weebly.com/uploads/1/3/5/3/135347210/4039054.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450036/normal_6037b09f87257.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/gezetega/60226681892.pdfIn PDF document text
    • https://s3.amazonaws.com/jodabiladezot/budismo_nichiren_daishonin.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_off0000f9cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CB 5312 bytes
SHA-256: 4bc050c2cc8294b0f139f03c3c98ecaa5f2a89503a6d51262b6a60c06b005d44
font_01_sfnt_off00010bdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDC 10492 bytes
SHA-256: 629818d74dc1be76fd5bc711af6fcef5bf22361b612d2b275a124ad5cff39c89
font_02_sfnt_off00012fd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FD6 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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