Malicious PDF — malware analysis report

Static analysis result for SHA-256 2133cce58de80691…

MALICIOUS

PDF

86.4 KB Created: 2021-02-15 07:50:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: a38e309e65a4720331f28f6c5d4c34fa SHA-1: 2546bf295a3670460be074e3777834e97e7e4edf SHA-256: 2133cce58de80691ce084f956ec91afc00cc637da0c9593f14aac5de85d6ba36
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting, suggesting it is part of an SEO link farm. The primary URL, 'https://baarspo.ru/wix?keyword=good+omens+script+book+pdf+free', is presented as a lure for a free PDF download. While no scripts were explicitly extracted, the PDF structure and the ML classifier's high confidence indicate malicious intent, likely to drive traffic to malicious sites or distribute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/wix?keyword=good+omens+script+book+pdf+free PDF link annotation
    • https://bubipirem.weebly.com/uploads/1/3/6/0/136086135/4295222.pdfIn PDF document text
    • https://jikumuwalomaj.weebly.com/uploads/1/3/1/3/131383204/6273070.pdfIn PDF document text
    • https://xaforegitada.weebly.com/uploads/1/3/1/4/131413040/tozaviremojawu_fomirebozuxoju.pdfIn PDF document text
    • https://gaxadujabe.weebly.com/uploads/1/3/0/7/130775632/5362981.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476416/normal_6007115b90111.pdfIn PDF document text
    • https://koropiliful.weebly.com/uploads/1/3/0/7/130740252/fb30f.pdfIn PDF document text
    • https://wowemaba.weebly.com/uploads/1/3/1/3/131380083/xolagusapisumolev.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420592/normal_6006465bbcd32.pdfIn PDF document text
    • https://gezedasi.weebly.com/uploads/1/3/1/3/131378850/xakavebesobifawoka.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418365/normal_5fd39c8422e4b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/viboxikuz/ruwap.pdfIn PDF document text
    • https://s3.amazonaws.com/juliziwojatige/pain_agitation_delirium_guidelines_2017.pdfIn PDF document text
    • http://gevegure.rf.gd/gelafitexemumumoj.pdfIn PDF document text
    • http://kujafugakare.epizy.com/bluetooth_for_hp_laptop.pdfIn PDF document text
    • http://luzeparuzibez.rf.gd/divide_into_equal_groups_worksheets.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11631 5292 bytes
SHA-256: 34cf13f9ee6a98df9181f3906a796de089e641f60dab556f647b0ed54f3562ba
font_01_sfnt_off00012821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12821 10888 bytes
SHA-256: 369209f67de8ba404dd51cdd06bb2dc2a03a5d4eb5ff5afae5d32d633c6aa8d6

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