Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2c7abfb37939060…

MALICIOUS

PDF

79.0 KB Created: 2021-02-02 09:14:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: adabf627920ded32836dda71820f1f35 SHA-1: 2d55eaea5c13937318674f78ecabbefa763f68d5 SHA-256: e2c7abfb37939060b81dcabbf6a6c9274b2ba2b2d3aad8720a739313b55bd979
164 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDF files, which is indicative of a link farm or SEO manipulation tactic. ClamAV detected this file as 'Pdf.Phishing.Trojan', and a critical heuristic identified it as a PDF SEO link farm. The presence of embedded URLs and a 'Download' button lure further supports a malicious intent, likely to direct users to phishing or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jottigo.ru/aws?utm_term=sync+google+drive+android PDF link annotation
    • https://cdn.sqhk.co/malevevipali/jaWlxwl/lolipiwonulepunupixenutal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481154/normal_6009d4ee2c73d.pdfIn PDF document text
    • https://cdn.sqhk.co/kinemefuwa/aCjhia6/lafokedog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368751/normal_5fd6e069ecf50.pdfIn PDF document text
    • https://nojemalof.weebly.com/uploads/1/3/0/8/130873850/17773.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373520/normal_5fc6125dcf276.pdfIn PDF document text
    • https://cdn.sqhk.co/monasomeb/iiidhfq/26623398133.pdfIn PDF document text
    • https://cdn.sqhk.co/vunebapenuj/qthi0T1/nowhere_to_run_free_movie_online.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404287/normal_5fe78f7ab38eb.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/vojapu/answer_key_basic_tactics_for_listening.pdfIn PDF document text
    • https://s3.amazonaws.com/zafaronivaj/8655682946.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_off0000ebf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF1 4900 bytes
SHA-256: 07f854a0ed1c3146fda0d6984d38d3133240872d8f4d826306a33a8a365d29b1
font_01_sfnt_off0000fc97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC97 10624 bytes
SHA-256: 684327b305133197746e6446aec7d289016d914dd270d888a263bde97b06d813
font_02_sfnt_off00012103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12103 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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