Malicious PDF — malware analysis report

Static analysis result for SHA-256 b474db3d4c90cc20…

MALICIOUS

PDF

84.7 KB Created: 2021-04-22 09:03:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 13b038ad8e38c4139325697ed754bfe6 SHA-1: e8d46fe381d6d964456315873eafc51843dd1637 SHA-256: b474db3d4c90cc208bdd461b4362d70eb74f7cb9da0ca14f4b0bed10e7667064
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 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://jottigo.ru/strik?utm_term=nordictrack+commercial+1750+customer+reviews PDF link annotation
    • https://kikitepolo.weebly.com/uploads/1/3/4/5/134514310/6772287.pdfIn PDF document text
    • https://tezewudewitifu.weebly.com/uploads/1/3/4/5/134524208/7413827.pdfIn PDF document text
    • https://cdn.sqhk.co/nezerozara/joDjjjf/denis_mcquail_audience_analysis.pdfIn PDF document text
    • https://nonuvatemex.weebly.com/uploads/1/3/4/4/134443968/2995852.pdfIn PDF document text
    • https://cdn.sqhk.co/keliziniw/57PSjhi/guided_meditation_script_for_kids.pdfIn PDF document text
    • https://nategenuniko.weebly.com/uploads/1/3/4/7/134749174/e8e2c1d5e74.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465548/normal_60521c2ce2fe5.pdfIn PDF document text
    • https://kenomixu.weebly.com/uploads/1/3/0/9/130969587/5910801.pdfIn PDF document text
    • https://kukonugaxa.weebly.com/uploads/1/3/5/3/135327287/3169798.pdfIn PDF document text
    • https://cdn.sqhk.co/sejiragidu/9gfjiEy/digraph_ch_worksheets_scholastic.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486363/normal_600ea02974e1d.pdfIn PDF document text
    • https://cdn.sqhk.co/ramawuvade/eiOhghh/75920295789.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4529024/normal_600142d5f0b4c.pdfIn PDF document text
    • https://wimavebitajiki.weebly.com/uploads/1/3/4/6/134609796/8621927.pdfIn PDF document text
    • https://tagewojozupuk.weebly.com/uploads/1/3/4/3/134358966/2643dbf7abd2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d128792e-e0a8-46e0-98ed-b941f5da69b2.filesusr.com/ugd/b98abb_e86e79f7b2374f26bb337b210ffe3556.pdf?index=trueIn PDF document text
    • http://petojijoxura.onlinewebshop.net/practical_biochemistry_for_medical_students.pdfIn PDF document text
    • http://wufagezigedo.onlinewebshop.net/85661253326.pdfIn PDF document text
    • https://97d49ff2-d914-4ae4-8ac8-5e5cf5f77cad.filesusr.com/ugd/6350c7_0cdf7b8c80b64232b9af19f1dfd928fe.pdf?index=trueIn PDF document text
    • https://b1d4f555-1eac-4d61-aa83-27206cf3ee4b.filesusr.com/ugd/1706f5_a8c9b65e07b4478baa7a5f8953941a2d.pdf?index=trueIn 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_off00010769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10769 5668 bytes
SHA-256: 568297bcdcd569146751688156b29f91f87ceaa10087db0b4878fae0a21fd140
font_01_sfnt_off00011ac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC7 11940 bytes
SHA-256: 0f4de89da199170b7b271f07ac7a17ac0883cd8c5639bcb3aee44894d1364856

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