Malicious PDF — malware analysis report

Static analysis result for SHA-256 139a795e132af539…

MALICIOUS

PDF

55.8 KB Created: 2020-11-07 14:24:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: e087a608f10ccee07d58addbfe002539 SHA-1: d7bfc7f119c0c9a43e1e340687c98bf8e7d7c27b SHA-256: 139a795e132af53972f544bc12a7a74e069aad21c82423e3283d44377e111e8d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • 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://traffine.ru/123?keyword=playa+vista+public+library+hours PDF link annotation
    • https://damijuvik.weebly.com/uploads/1/3/1/3/131381376/xaperasopa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369922/normal_5f9ae0d4c54cb.pdfIn PDF document text
    • https://xolawawasaxigu.weebly.com/uploads/1/3/4/5/134587427/tegibipizejape.pdfIn PDF document text
    • https://furutivox.weebly.com/uploads/1/3/4/3/134360368/4515230.pdfIn PDF document text
    • https://lavuzolitad.weebly.com/uploads/1/3/4/3/134327879/987887.pdfIn PDF document text
    • https://wesegirudupu.weebly.com/uploads/1/3/4/6/134631264/vuxugexidovofidomi.pdfIn PDF document text
    • https://zoxaminajoge.weebly.com/uploads/1/3/1/6/131637873/9079236.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/a6a5c493-8367-4502-acc6-08cdf3509f19/jitusilupu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/582c10b3-ceee-4652-841c-3a988f362012/images_of_drops_of_blood.pdfIn PDF document text
    • https://lodoxepal.files.wordpress.com/2020/11/reremuradivuvevedivogobid.pdfIn PDF document text
    • https://solipisona.files.wordpress.com/2020/11/rojerofaretawugasokujam.pdfIn PDF document text
    • https://sipodugegir.files.wordpress.com/2020/11/3_way_handshake_protocol.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007fa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7FA9 3288 bytes
SHA-256: bea8cd1bfe700c52367947a3441ef10185a5a5b497ed8b690a52582157afc652
font_01_sfnt_off00008b96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B96 4980 bytes
SHA-256: 3b8afefbd0096be1290517e9009474a0e1b03c995acdb2c5c7868a7a4cce28e8
font_02_sfnt_off00009c93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9C93 11700 bytes
SHA-256: aad4d9aac706544030b84bae3b84a171a529dcdfab8ea8ed9b951e9620152cb8
font_03_sfnt_off0000c3af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3AF 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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