Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8192f51f30a466c…

MALICIOUS

PDF

75.8 KB Created: 2020-11-25 16:33:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 52a39eef5cc265f2969d566485b818da SHA-1: b2360ab01c595c2b58829448705b8e9fd7e1d67a SHA-256: a8192f51f30a466c86c2e2fac94976d18e9e614a08e366f3d7ab53d5e6df1258
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9996

Heuristics 4

  • 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.
  • 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?utm_term=ryobi+3100+pressure+washer+parts PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4382407/normal_5f920f317b6d5.pdfIn PDF document text
    • https://jukawowirorab.weebly.com/uploads/1/3/4/6/134662443/8700592.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412195/normal_5fbdff6d105c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390068/normal_5fb8cfb9eb542.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469143/normal_5fafeef140542.pdfIn PDF document text
    • https://jipaxebuperiw.weebly.com/uploads/1/3/4/7/134751602/pezudid-rotenebodize-lufosufuruw-xujudedelaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382196/normal_5fa363c614e81.pdfIn PDF document text
    • https://mulodunewumil.weebly.com/uploads/1/3/4/3/134314444/5438291.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375517/normal_5f9ca0b581121.pdfIn PDF document text
    • https://zenovoruzunej.weebly.com/uploads/1/3/4/3/134339910/megisavojewop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383923/normal_5f9fb8b319126.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/147dde3d-41c8-4ba0-92c8-bf5e45f34836/zitefunimibamot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a4d5040-a2b1-4c4a-a48a-d94c7a8b8f10/atascadero_unified_school_district_jobs.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c1cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1CB 5348 bytes
SHA-256: 2653a83a749772ba4a65a694627aaa32cf5477ad3eccc8f4eaf79b121bf5f6fc
font_01_sfnt_off0000d426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD426 10028 bytes
SHA-256: 3b6ed42f71640ce1a482fd0bca48112f7d4f54d9dbf9a17d845af09d52839b60
font_02_sfnt_off0000f6b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B4 18592 bytes
SHA-256: 386bd14c31c876bd7b71afa6aceea74f7e65c3c1475512d2e9e6a34eeaaa5c73
font_03_sfnt_off000113de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113DE 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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