Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd35fca3b911a8d0…

MALICIOUS

PDF

42.4 KB Created: 2020-11-05 21:51:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 0db861ebb98f4285719a148955b551b0 SHA-1: 924d93dc743fae29f8159922a54955402c1eaaaa SHA-256: cd35fca3b911a8d0fb64da9be9dee6bf7af973fcdf7776857ad81eae69fcb31c
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=pathfinder+giant+hermit+crab PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4401515/normal_5f9ec55b4434d.pdfIn PDF document text
    • https://muvesajaduxu.weebly.com/uploads/1/3/4/0/134012660/jamifamojuwizog.pdfIn PDF document text
    • https://bawuzuxagoju.weebly.com/uploads/1/3/4/3/134340420/bf3d2f.pdfIn PDF document text
    • https://direvegafazago.weebly.com/uploads/1/3/4/4/134491376/7893672.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389793/normal_5f95e58ba0cd6.pdfIn PDF document text
    • https://jonukejunuxesa.weebly.com/uploads/1/3/1/4/131409236/todidudivonedi-bimuzojoxuke-kibamabutal-dakaned.pdfIn PDF document text
    • https://zibeselev.weebly.com/uploads/1/3/4/1/134131471/f1672414b2e6.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/c2f83881-d912-4966-aa03-8007ddd58c4a/92366171761.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff2917f3-2132-4ac3-b7dd-267f907f06e5/vapabilovigimavinaxav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13f10451-3a65-4464-a86d-544bb0f9ce8e/76196925995.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1f0f37c-3658-4432-9bb0-9e8f46a7e873/tuguferaduzekur.pdfIn PDF document text
    • https://s3.amazonaws.com/ladojenefe/8192703712.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ec0c4f5-e393-48a2-86a2-41014e007fa6/wifilax.pdfIn PDF document text
    • https://s3.amazonaws.com/zuguvoxoki/frsky_x8r_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b9c1e21-919a-4ac5-a49d-6015fc374bdf/adobe_reader_offline_installer_xp.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_off000065a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65A6 5364 bytes
SHA-256: 251ca2f8a7916e9cddfe285e6e0e3dfd69991f283cffbaa563c950ff396dba43
font_01_sfnt_off000077bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x77BC 11016 bytes
SHA-256: 4333c43724b6b944570f5e1ea50bbcee8682114e654e07b4df789ac3689f5bc1

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