Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6310df5bfd40df9…

MALICIOUS

PDF

95.3 KB Created: 2021-03-15 06:02:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: f36ab42c2d8063a508e6d8d91a00ed20 SHA-1: 9491d98ec2e5839be43056693ca159d3c8761954 SHA-256: d6310df5bfd40df9ec3e45ad464feaa6ef5a3541239fab1c68cf162242258c8a
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO spam campaign. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically a phishing or trojan payload. The embedded URL and the document's structure point towards an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://maypoin.ru/wix?keyword=power+pressure+cooker+xl+8+quart+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4459794/normal_6033185e870a3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488330/normal_5ff2bba821fd5.pdfIn PDF document text
    • http://zitarekatinupas.sportsontheweb.net/dependability_definition.pdfIn PDF document text
    • https://gubijebe.weebly.com/uploads/1/3/1/4/131483267/tabalarorupulo-gokuvoxunorotif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460231/normal_6011dc3e730c4.pdfIn PDF document text
    • https://lasebotoxuxuxir.weebly.com/uploads/1/3/4/7/134729765/kugasar.pdfIn PDF document text
    • http://gosunenibunale.getenjoyment.net/37885652816.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405899/normal_60437c700de54.pdfIn PDF document text
    • https://dupukixulin.weebly.com/uploads/1/3/2/6/132681516/47b67ce304b533a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414335/normal_60140774a8bd5.pdfIn PDF document text
    • https://zabavorurexezab.weebly.com/uploads/1/3/5/3/135314693/8295953.pdfIn PDF document text
    • https://xaforegitada.weebly.com/uploads/1/3/1/4/131413040/jafika-pumatutev.pdfIn PDF document text
    • https://kivepuwepadile.weebly.com/uploads/1/3/4/3/134392404/6b79ef0b3a62de8.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/a3bce54f-49dc-4523-9498-f70ffa38b706/rasabezixi.pdfIn PDF document text
    • https://aa6d2f86-95e2-42cc-897e-6bbd71c3a116.filesusr.com/ugd/78daac_832bc8d16b4a44ca9db72b14a8be69ec.pdf?index=trueIn PDF document text
    • https://ae26bae5-b1f3-4fb2-a0ba-5d2f2d23988c.filesusr.com/ugd/aec2ea_7b38177939d74e4bb03840154292eb48.pdf?index=trueIn PDF document text
    • https://981168d4-05fc-44b6-871d-73371d7e8cf1.filesusr.com/ugd/87d215_778057da307b453da55bca6641ab4eb1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bb4277f-7756-4877-a7df-783b746a5458/sekaga.pdfIn PDF document text
    • https://387a498e-9551-4239-9507-3183ba214552.filesusr.com/ugd/cd403b_862736b5e9e6417f9be8ea210a0533f8.pdf?index=trueIn PDF document text
    • http://lawaxisagiwog.atwebpages.com/19502382256.pdfIn PDF document text
    • https://5cbbff6b-7c47-4fbb-abda-9de5069fbc88.filesusr.com/ugd/1a89c8_99a16a4a8ec64501a9e162fcf6756861.pdf?index=trueIn 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_off00013329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13329 5624 bytes
SHA-256: 8e200dcac03befb7c101c5fadc46d9ce2a45b1f48803957196823db2310dd915
font_01_sfnt_off00014654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14654 11728 bytes
SHA-256: 72ba64a5eac5460c84d18d88457041619ef41578aa3df1c8f1325751a266d1b5