Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d01a67eba4ba1c2…

MALICIOUS

PDF

64.0 KB Created: 2020-11-09 10:41:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 4893bf13ed16d9aa785cd48e2a02640a SHA-1: dead959693beac0ba1b331aac97bab7862faaa36 SHA-256: 2d01a67eba4ba1c2ba5fbb7a682a9c4fbe42caefa391e939f9afa15f208db395
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains and Weebly hosting, indicating a link farm. The ML classifier strongly flagged this PDF as malicious. The embedded URLs and the structure suggest a tactic to drive traffic to potentially malicious or ad-heavy sites, masquerading as SEO content.

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://trafffe.ru/123?keyword=second+kalma+meaning PDF link annotation
    • https://fifowekuvepu.weebly.com/uploads/1/3/0/7/130776735/lomoxudodepajoniwes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388289/normal_5fa23e75df111.pdfIn PDF document text
    • https://widutelakil.weebly.com/uploads/1/3/4/3/134378670/neluzutudakun_kepod_nogubesogugoxox.pdfIn PDF document text
    • https://jagotizepevex.weebly.com/uploads/1/3/4/4/134464701/lamoluzaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444095/normal_5fa113edb3f2b.pdfIn PDF document text
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/2c029f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403413/normal_5f926933dbf42.pdfIn PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/dekegu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449992/normal_5f9efda0933ab.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://sosomaper.files.wordpress.com/2020/11/43649395893.pdfIn PDF document text
    • https://sirilab.files.wordpress.com/2020/11/tabifenid.pdfIn PDF document text
    • https://wejogude.files.wordpress.com/2020/11/niwasegini.pdfIn PDF document text
    • https://ronesifipule.files.wordpress.com/2020/11/pasefojowabe.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0000b4cc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xB4CC 27280 bytes
SHA-256: ba139ec175887a72f900cc56cda05006ee2e956e4ce8f0452236a728b8dc1c9e
font_00_sfnt_off00007a26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A26 4860 bytes
SHA-256: 3ae225b941f260657ab466273ab278936924e294f83ac7f79c17b52f833adcc0
font_01_sfnt_off00008a84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A84 13952 bytes
SHA-256: 9ccdd32d694db30765f0d0f1870cace2c997e122ebaa5bdf74108d1054ec9506
font_03_sfnt_off0000e4d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D7 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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