Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab56a6e7bbb36857…

MALICIOUS

PDF

70.6 KB Created: 2021-02-16 12:14:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: ac0c03d2f71401b2e665d41781b9724b SHA-1: 40305289c8751c034a2b2efb034fe3855fd06baa SHA-256: ab56a6e7bbb36857f169e5ded01f29bbf95ab2c3a361d763ba4af4f3d2c23756
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 other PDF files, suggesting a link farm or redirection mechanism. The heuristic PDF_SEO_LINK_FARM and ClamAV detection indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, contains keywords related to disassembly, which is used as a lure to direct users to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/wb?keyword=how%20to%20take%20samsung%20ice%20maker%20apart PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4375531/normal_600437e5a4cd3.pdfIn PDF document text
    • https://cdn.sqhk.co/dafibuxoki/cr2kSyX/mini_pin_bowling_milwaukee.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376858/normal_5fe1682554030.pdfIn PDF document text
    • http://grantmedica.ru/68375628445c8c99.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459645/normal_6014eb53bb30d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475847/normal_6027c03277bb2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421042/normal_5fc6651f75f42.pdfIn PDF document text
    • https://serewutedirafam.weebly.com/uploads/1/3/5/3/135339767/karoj-gijamikudomopa-gizaxakodulu-kimogipa.pdfIn PDF document text
    • http://50offshop.info/instagram_feed_planner_templatepvvt6.pdfIn PDF document text
    • https://wunabigoji.weebly.com/uploads/1/3/4/8/134891590/4940555.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403820/normal_5ff787d2ddee2.pdfIn PDF document text
    • https://cdn.sqhk.co/mowanideju/hejijg8/zulejutafige.pdfIn PDF document text
    • http://pearhaidhr.fun/ruwek9ymnk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485580/normal_600bb313c38af.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvonazavo/5jijbje/30576518693.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485454/normal_5fda330c0d5ca.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417025/normal_600206283282c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mefovu/netflix_app_for_windows_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/jixeremipet/love_divine_all_loves_excelling_lead_sheet.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B2 5336 bytes
SHA-256: 9d39f5ea69d6eb7b575f79724028bf146c72be2e0dd11aff710ad3fdbe685ddb
font_01_sfnt_off0000e9dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DC 10396 bytes
SHA-256: 2de669556cf3d49e47514cc84cf5514d2a058d0dbe6d950d8f1b24165ec2ced9

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