Malicious PDF — malware analysis report

Static analysis result for SHA-256 82c435029fd4eef9…

MALICIOUS

PDF

47.1 KB Created: 2020-11-05 16:49:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 82d4e1a985f24e8f541dc065ebc79ab0 SHA-1: d840ebe9663ba4f3add279d64bac7a339502a204 SHA-256: 82c435029fd4eef9b0401ea91420addcb2977ef7ac249af1ce9ee42c263188f4
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://trafficel.ru/aws?keyword=plants+vs+zombies+3+pre+alpha+apkpure PDF link annotation
    • https://tupipukevoluda.weebly.com/uploads/1/3/4/0/134041298/lutamovizuluguwodov.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384150/normal_5f8f5aac6b7f7.pdfIn PDF document text
    • https://bivixogerixud.weebly.com/uploads/1/3/4/4/134469213/7da30171a1f.pdfIn PDF document text
    • https://falogumirej.weebly.com/uploads/1/3/4/3/134368081/lofabisada.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383322/normal_5f8ef6e677529.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375909/normal_5f9921563aee0.pdfIn PDF document text
    • https://jawowigo.weebly.com/uploads/1/3/0/7/130774982/tojejasevodo.pdfIn PDF document text
    • https://gegakavawedo.weebly.com/uploads/1/3/4/2/134265750/dobegetuzura.pdfIn PDF document text
    • https://wosezobar.weebly.com/uploads/1/3/1/8/131856012/xofij.pdfIn PDF document text
    • https://valoxapemep.weebly.com/uploads/1/3/4/3/134305175/rigesavijon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381090/normal_5f90602c21c80.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/77f7ee55-38d2-435e-8363-7029f10437e3/debuvumegatowaj.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F81 5540 bytes
SHA-256: 9aaef26d0d0e88289309c4498635d317f4489116f074b5f1567c9d308c9292d3
font_01_sfnt_off00007235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7235 10916 bytes
SHA-256: ce1671769b8724d5f0068e688c3970c717ece1ea0cceb6278ecb8fa94d56f8ce
font_02_sfnt_off000097a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x97A1 16468 bytes
SHA-256: 75e946b225aa6b4b55ab3e5a518bfcd20061ab3d93a9d21aaf366d4e54857459

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