Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1869b84337056e8…

MALICIOUS

PDF

75.4 KB Created: 2020-12-30 17:19:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: b70399297eefa8ae50fa94a4929d2650 SHA-1: e91d04d1433ba5443eb7baa030156ce114dade12 SHA-256: b1869b84337056e86029a47ec378184c74d60ad4f91b8b54ec381455ee8de731
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains embedded URLs and is flagged by heuristics as a link farm on disposable hosting, suggesting a phishing or scam attempt. The document body, though heavily obfuscated, contains text related to 'Tempur pedic dog beds for large dogs' and authoring application details, likely a lure to direct users to malicious websites. The presence of external URIs and the ML classifier's high confidence score indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/123?utm_term=tempur+pedic+dog+beds+for+large+dogs PDF link annotation
    • https://pikoxujedogusu.weebly.com/uploads/1/3/4/6/134665618/8348860.pdfIn PDF document text
    • https://zemezomar.weebly.com/uploads/1/3/4/7/134711889/9ba3ef70c9.pdfIn PDF document text
    • https://sisodiwitamusoz.weebly.com/uploads/1/3/2/6/132681746/1543378.pdfIn PDF document text
    • https://nujobivodiji.weebly.com/uploads/1/3/4/7/134771327/3050210.pdfIn PDF document text
    • https://dalenorilesa.weebly.com/uploads/1/3/4/8/134858788/rabofurinazoruvigop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387715/normal_5fe6b5c65fcf0.pdfIn PDF document text
    • https://lajanasana.weebly.com/uploads/1/3/4/3/134368101/fanuxozef.pdfIn PDF document text
    • https://gogebuzavoriro.weebly.com/uploads/1/3/2/6/132681212/8308692.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/wusigipufuvowix/65903449027.pdfIn PDF document text
    • https://s3.amazonaws.com/bubisifapagefe/words_with_dge_ending.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3f53578-e2ef-4536-8a6b-13305f482252/4844365241.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_off0000e83a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83A 5564 bytes
SHA-256: 35ab71ad3582705ca2b361be80b0464f77c66638fed1d321ddb0944720516d3e
font_01_sfnt_off0000fb0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0B 11036 bytes
SHA-256: 448abeff08d50700013414973f6a4340d6edb7b6e08665a0981dfb1a284fa719

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