Malicious PDF — malware analysis report

Static analysis result for SHA-256 4953c9b75b4f729c…

MALICIOUS

PDF

62.7 KB Created: 2020-12-18 05:52:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: b39af94eab5f7f4efc89570955912058 SHA-1: bebcd9dcffc9776a9d3a39fdfaf0f02089e3f74d SHA-256: 4953c9b75b4f729c58a4f139bfc020b15036797555e0ea11d7bf826f8c896f48
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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 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://trafffi.ru/123?utm_term=sten+gun+parts PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4474218/normal_5fb66c2843f04.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374198/normal_5f8eab0f8af32.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407777/normal_5fab537331c7f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463812/normal_5fc396638d74d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380694/normal_5fb66ef708341.pdfIn PDF document text
    • https://bubixoduxufito.weebly.com/uploads/1/3/1/0/131070588/47bc6529ec.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378621/normal_5fcea5d5d460d.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/gurupixabogivaz/android_wear_play_store_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc6b0b3c-7723-4fd7-8101-98c7b72f9c8e/other_voices_other_rooms_first_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/verirejon/information_associated_with_your_facebook_account.pdfIn PDF document text
    • https://s3.amazonaws.com/lovetijif/22310372354.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb66d97e-2f53-4c98-9cc2-c02048b30dbc/berts_mega_mall_jet_ski.pdfIn PDF document text
    • https://s3.amazonaws.com/petikamov/44737219509.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

Related samples 6

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB961 5056 bytes
SHA-256: 465a3f7ad2aa48e9bebcb93e1ce4e6427e498fbf48654574c5391c00ba0cc477
font_01_sfnt_off0000caa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA0 10460 bytes
SHA-256: 7a40f0cc757499912f93302cc141eb4ea2dd126081eb96f58903e0ef9615217c

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