Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf811272a30dbe2c…

MALICIOUS

PDF

74.8 KB Created: 2020-12-26 05:40:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: e432e1f80f52bcedbf8f297c1518bc6b SHA-1: 97e16315c7498a23b76107f5d8bbe28270a6a780 SHA-256: cf811272a30dbe2caf8e6fae6236a7a5e96a072806dbdf731c03c61b1cb1416d
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded links suggests an attempt to lure users to external sites, likely for phishing or to download further malicious content.

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
  • 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.
  • 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://traffmen.ru/123?utm_term=chopsticks+sheet+music In PDF document text
    • https://cdn-cms.f-static.net/uploads/4462736/normal_5fae7654f09d6.pdfIn PDF document text
    • https://cdn.sqhk.co/gotirawuz/jtjbhj2/hard_boiled_eggs_instant_pot_555.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457279/normal_5fd95da0f0f49.pdfIn PDF document text
    • https://cdn.sqhk.co/kibizatududo/SboBPpz/spanish_tapas_sandwiches.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410703/normal_5fcb9bcd19813.pdfIn PDF document text
    • https://rowafitiw.weebly.com/uploads/1/3/4/6/134608100/mugux-gokegubu-mabipupafarova-safaxenaf.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwumixe/fyhijiS/color_rolling_stones.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411483/normal_5f9a11c6dde60.pdfIn PDF document text
    • https://bezoduremudopez.weebly.com/uploads/1/3/1/4/131437412/3bd32.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/817af0b8-2f39-434d-9110-deb41e976d20/proper_format_for_writing_a_letter.pdfIn PDF document text
    • https://s3.amazonaws.com/vajefam/vafirotokidinu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a201fce4-6d0d-47cc-bd74-840909a57652/crunchyroll_premium_plus_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab2e1f3c-7554-47eb-8cec-607b88d37a45/resident_evil_final.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5d26e5c-72ff-487c-9486-58622bd23ad6/32218201579.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a463a03-3693-487f-9983-6904af00eac4/boku_no_hero_academia_season_1_episode_14.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_off0000e8d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D2 4804 bytes
SHA-256: 3fd48f828609c0af6c9e6923540873c7662d07ae492515e8ecfe11b1343ab5c6
font_01_sfnt_off0000f903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF903 11244 bytes
SHA-256: d5303316d7dff67103512f88ded63e21b435feefc08a2f3878bd2f44bbce4c48

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