Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d9f6038b4556284…

MALICIOUS

PDF

67.6 KB Created: 2021-02-18 05:33:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e78492614e9f442d5441a0b079a329ce SHA-1: f03b0e23bb9dccdf8c35bebf12a9722bd41f4de1 SHA-256: 4d9f6038b4556284aaddc22ae1eecd5afc5e0b57f0a709415d1df4beeac73fb4
252 Risk Score

Malware Insights

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

This PDF document contains numerous links designed to appear as legitimate content, but they redirect to malicious infrastructure. The primary redirector URL is https://yafferge.ru/aws?utm_term=ariens+efi+snowblower+won%2527t+start, which is part of a link farm strategy. The document's structure and numerous outbound links suggest a phishing or SEO poisoning attack aimed at driving traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9705

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://yafferge.ru/aws?utm_term=ariens+efi+snowblower+won%2527t+start In PDF document text
    • https://cdn.sqhk.co/linewebozid/BfxWFja/3342986879.pdfIn PDF document text
    • https://favasonod.weebly.com/uploads/1/3/2/7/132740296/4682560.pdfIn PDF document text
    • https://cdn.sqhk.co/pifajaloro/hjggaja/retro_games_plus_milford.pdfIn PDF document text
    • https://cdn.sqhk.co/siganewita/fRhbMig/alex_gordon_apk.pdfIn PDF document text
    • https://talupujepanuzan.weebly.com/uploads/1/3/4/5/134595677/8938607.pdfIn PDF document text
    • https://volovumonanegom.weebly.com/uploads/1/3/5/9/135967081/nesemaputenanon-gigizituxos-radipa.pdfIn PDF document text
    • https://cdn.sqhk.co/kedezoge/gfjagcQ/60300131861.pdfIn PDF document text
    • https://cdn.sqhk.co/puberufibo/jCzig2f/cheap_strikers_1945_classic_uptodown.pdfIn PDF document text
    • https://cdn.sqhk.co/gavezexu/gcwLoij/brasfoot_2019_atualizacao_setembro.pdfIn PDF document text
    • https://cdn.sqhk.co/noperizapewo/imnhgFT/fadadifidozika.pdfIn PDF document text
    • https://zizopozuwugova.weebly.com/uploads/1/3/0/7/130775786/b45e9806adc3f35.pdfIn PDF document text
    • https://cdn.sqhk.co/puruwedisuma/Nha9Qie/shelter_insurance_agency_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/vekuperik/cHKYVha/black_white_and_gold_coffin_nails.pdfIn PDF document text
    • https://cdn.sqhk.co/tedalome/himkJgg/ledenudes.pdfIn PDF document text
    • https://bopojebokup.weebly.com/uploads/1/3/1/4/131408204/acb4ad9d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE6D 5016 bytes
SHA-256: ce3dc99cad37256a757763eefcd99a476077daa2ad9805fa4b1f24affcf96d91

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