Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cf51d73e592e84d…

MALICIOUS

PDF

42.3 KB Created: 2020-11-07 00:58:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 30107d0862e085671e51bcf95244a0f5 SHA-1: d8a1f5f079d28c6630e1e84197c2bbcd5ca86a5f SHA-256: 0cf51d73e592e84deffccf8f3040d4f1ef98fed7b8ad87eea3e8dc629fa24f34
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://traffset.ru/aws?keyword=pirelli+calendar+2010+models PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4423155/normal_5f98588c0a4f3.pdfIn PDF document text
    • https://genigudepa.weebly.com/uploads/1/3/1/0/131070712/vovofofaverun_sawivurovoj_nifawubazox.pdfIn PDF document text
    • https://mawanegofarate.weebly.com/uploads/1/3/4/4/134466522/lasupukunuza.pdfIn PDF document text
    • https://tidemipevu.weebly.com/uploads/1/3/0/7/130740592/semoxowiwelile.pdfIn PDF document text
    • https://nobinetezo.weebly.com/uploads/1/3/0/9/130969761/dowixipadutume.pdfIn PDF document text
    • https://sokuvotaboraj.weebly.com/uploads/1/3/0/7/130776263/9847291.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/0779786f-7df4-40da-81cf-aa4c432ec4d1/66220866736.pdfIn PDF document text
    • https://salemug.files.wordpress.com/2020/11/vodexudajekam.pdfIn PDF document text
    • https://lizuruvinulu.files.wordpress.com/2020/11/skyrim_special_edition_savegame.pdfIn PDF document text
    • https://rezekine.files.wordpress.com/2020/11/tatojesanawav.pdfIn PDF document text
    • https://tusomoxuxa.files.wordpress.com/2020/11/garmin_3210_for_sale.pdfIn PDF document text
    • https://rewuvitosil180903676.files.wordpress.com/2020/11/xegabaripupofirebinolizug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aec14622-b66e-4107-ad98-ba76cb280a03/20220121526.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_off000067b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67B6 5412 bytes
SHA-256: e71bc95f1ac489827dffe3e0f277540ca1c989ad25690b601110043c76dc923e
font_01_sfnt_off00007a04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A04 10172 bytes
SHA-256: 47ac8249bcc5b33541525a1438efc1d7ed8505f2434cc6a27f84ab5dc91563d6

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