Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d7d014fb5fb2f46…

MALICIOUS

PDF

68.8 KB Created: 2020-12-31 17:51:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: f36f10b3ff33817054df23b507909585 SHA-1: c3a28920748e9220e3fe0760c18c43937a7b27c1 SHA-256: 5d7d014fb5fb2f4616edc9fe5dcdcb4f30a84ae848599689c037973f4e1c197d
164 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://trafffe.ru/strik?utm_term=standoff+multiplayer+mod+apk+revdl PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4498978/normal_5fc27ed465051.pdfIn PDF document text
    • https://dukalafaziwemum.weebly.com/uploads/1/3/4/7/134772398/pukaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407804/normal_5f944b05484b8.pdfIn PDF document text
    • https://gejipowuxenufo.weebly.com/uploads/1/3/4/6/134681439/9030732.pdfIn PDF document text
    • https://rudanivaxaf.weebly.com/uploads/1/3/4/4/134497940/1df001ca252a.pdfIn PDF document text
    • https://cdn.sqhk.co/naxiwakiwuv/Tq8HlM9/cultist_simulator_bird_worm_arg.pdfIn PDF document text
    • https://zumavekuganupa.weebly.com/uploads/1/3/4/3/134366180/1469750.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370303/normal_5f89f9a491139.pdfIn PDF document text
    • https://moxipilewuzeget.weebly.com/uploads/1/3/4/3/134360433/b77876cb211.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412894/normal_5fd9bc6ac7432.pdfIn PDF document text
    • https://cdn.sqhk.co/lukedivibeb/idMhbmV/arduino_sumo_robot_programming.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/lorifawuvawot/email_template_zoho_creator.pdfIn PDF document text
    • https://s3.amazonaws.com/lebaxa/music_sheet_symbols_piano_reading.pdfIn PDF document text
    • https://s3.amazonaws.com/xisakazelelinim/epf_online_form_15g.pdfIn PDF document text
    • https://s3.amazonaws.com/purixifusipelid/grinch_film_izle.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_off0000cd59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD59 5340 bytes
SHA-256: 46ce87e54031f9648e1385e5856a116f186c6897106e8830a0071af0fd11836b
font_01_sfnt_off0000df7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7F 12056 bytes
SHA-256: de4bf5ee2de49b36019534b0c8e20b241215300244f85562cf82bfe012ea9ca0

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