Malicious PDF — malware analysis report

Static analysis result for SHA-256 48ec208f865f9f34…

MALICIOUS

PDF

64.7 KB Created: 2020-11-07 03:59:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 50faf0900c67a3682d02acc13519c6cd SHA-1: d3499e74799339af80a7f58433accce614a233f4 SHA-256: 48ec208f865f9f3403141a0efb4e50c89bb830c6faac4e2f826975ff2c128fb9
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/123?keyword=list+of+binary+covalent+compounds PDF link annotation
    • https://foxegakadop.weebly.com/uploads/1/3/4/3/134337736/08761ae1.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/8374020.pdfIn PDF document text
    • https://velabusodogir.weebly.com/uploads/1/3/1/8/131858366/biposuguxob_pifikujo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402262/normal_5f9f044a9b5f8.pdfIn PDF document text
    • https://nitetezelimon.weebly.com/uploads/1/3/1/4/131438651/a917684.pdfIn PDF document text
    • https://netaluzubik.weebly.com/uploads/1/3/0/8/130813777/zekejiwonox_jozowumef.pdfIn PDF document text
    • https://pepisukuwen.weebly.com/uploads/1/3/1/6/131606293/xodagejizorininagas.pdfIn PDF document text
    • https://kojepogezoxuta.weebly.com/uploads/1/3/4/4/134487575/2209744.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415546/normal_5fa2ee2c20dbc.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/a30b3bf6-0c80-402f-afde-3bc9aa024b29/will_durant_philosophy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a82061a-05e0-44c9-9074-73b4f7976119/12804715086.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62ec862c-1c3b-4fed-928e-c521254ec775/vusotefadijofixira.pdfIn PDF document text
    • https://galitedavaku.files.wordpress.com/2020/11/72736015109.pdfIn PDF document text
    • https://zesosuro568656899.files.wordpress.com/2020/11/lifefomabur.pdfIn PDF document text
    • https://vedujobajebo.files.wordpress.com/2020/11/66055604778.pdfIn PDF document text
    • https://lodoxepal.files.wordpress.com/2020/11/vibinofa.pdfIn PDF document text
    • https://xelinatuki.files.wordpress.com/2020/11/12873235441.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_off0000b810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB810 5544 bytes
SHA-256: 4ba414c6ddc311c9985a81f668a26969e5e2dd9512108e9dc76401725da54dd0
font_01_sfnt_off0000cae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE2 12252 bytes
SHA-256: 2cda62bb584516d8df297da7e535ad67551e3b07222927d0879e9d39c2de4f73

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