Malicious PDF — malware analysis report

Static analysis result for SHA-256 6439edb06b7840a0…

MALICIOUS

PDF

84.5 KB Created: 2021-06-10 15:07:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5b530a01bc91742b3d930110cfdce9ed SHA-1: aa21abadf2f27c4244fb04decb996601ab084c4e SHA-256: 6439edb06b7840a01b64e120bec94517fda67e83ca15d43451ef31f032ff8d35
156 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for PDF_SEO_LINK_FARM, indicating it's part of a link farm designed to manipulate search engine results. The embedded URL `https://irlanc.ru/pbw?utm_term=extreme+car+driving+simulator+apk+hack` suggests a lure related to game cheats, likely to phish for credentials or distribute malware. ClamAV detection as `Pdf.Phishing.Trojan` further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://irlanc.ru/pbw?utm_term=extreme+car+driving+simulator+apk+hack
    • https://gatiwisukebemo.weebly.com/uploads/1/3/1/4/131438587/5497440.pdf
    • https://cdn-cms.f-static.net/uploads/4502268/normal_6040e7d6f3a15.pdf
    • https://cdn-cms.f-static.net/uploads/4467589/normal_603c5d8ec17f2.pdf
    • https://cdn-cms.f-static.net/uploads/4404528/normal_60365181d61b4.pdf
    • https://static.s123-cdn-static-d.com/uploads/4373304/normal_60b6ab9bd5b0a.pdf
    • https://duboxudufafuboj.weebly.com/uploads/1/3/4/6/134676192/da00c77.pdf
    • https://cdn-cms.f-static.net/uploads/4368500/normal_602f895007c59.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/2fea49ab-2690-4e1d-99a7-74b5f22931ca/10422287600.pdf
    • https://uploads.strikinglycdn.com/files/ba648ceb-bbd5-495d-92d6-363d17b5d51d/honeywell_6000_instruction_manual.pdf
    • https://uploads.strikinglycdn.com/files/32bbfc4e-223c-4eea-8000-1ce9a0d06b44/zakeguvefokojuga.pdf
    • https://uploads.strikinglycdn.com/files/672d8173-3c89-4d92-8f85-d04861291768/mimibudov.pdf
    • http://wojipag.pbworks.com/f/90614305681.pdf
    • https://uploads.strikinglycdn.com/files/f247750c-ddab-453f-be55-5955fc710151/31540229365.pdf
    • http://kizisoj.pbworks.com/f/seeking_allah_finding_jesus_audiobook_free.pdf
    • https://uploads.strikinglycdn.com/files/50cff242-ebfa-4393-b619-05e1fa52e352/does_acceleration_due_to_gravity_change_with_height.pdf
    • https://uploads.strikinglycdn.com/files/c75ccfb7-8f1d-4603-8de6-748c91da24ef/gogajibowezexijujogefes.pdf
    • http://giwupiraride.pbworks.com/f/what_is_black_hole.pdf
    • http://kigiputilik.pbworks.com/f/how_to_program_a_braeburn_thermostat_2200nc.pdf
    • https://uploads.strikinglycdn.com/files/1f91dad9-2b03-4cfb-b804-2b1892401983/majosirosilu.pdf
    • https://uploads.strikinglycdn.com/files/6f30dd57-8626-435f-8a14-90ee55c0361a/vavudiz.pdf
    • https://uploads.strikinglycdn.com/files/a46546c0-05b0-41a2-b1e0-2ec306530fd0/7485930243.pdf
    • https://uploads.strikinglycdn.com/files/a631cbda-d247-4266-a711-3a520a26becd/what_do_the_3_branches_of_government.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001087b.bin
ea91c9f8d36de3ef5a5ad29547042a6d81a6005a582f2503a183ec1ff5e264c1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1087B 5636 bytes
font_01_sfnt_off00011b8d.bin
1284a791adf5bf1a60561c3143b1c147f8946bef57fd7dba762f80c77977ebd1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B8D 11548 bytes