Malicious PDF — malware analysis report

Static analysis result for SHA-256 14a4c7f3e31f0b6f…

MALICIOUS

PDF

73.8 KB Created: 2021-04-13 10:02:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: c85541606bf4183d28ab598ee2ab77d3 SHA-1: d7089320c7482247d413dd67fad3138041fa94fd SHA-256: 14a4c7f3e31f0b6fcc222c623e228f128d2fa8dc9a3a38000933e7e5c79c33dc
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and 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 0.9997

Heuristics 6

  • 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 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://nipisod.ru/strik?utm_term=music+theory+books+for+college PDF link annotation
    • http://raisinshq.pro/306607529075mdy8.pdfIn PDF document text
    • https://zanewodibamejat.weebly.com/uploads/1/3/0/9/130969445/706d62ea.pdfIn PDF document text
    • https://kevefizi.weebly.com/uploads/1/3/1/8/131871405/351255.pdfIn PDF document text
    • https://fojexoduzasob.weebly.com/uploads/1/3/4/6/134693365/acbd5c7961307.pdfIn PDF document text
    • https://fabuduviwanor.weebly.com/uploads/1/3/4/7/134739750/ede1d.pdfIn PDF document text
    • https://bezebaterizijir.weebly.com/uploads/1/3/1/3/131384714/fifakiwiwax.pdfIn PDF document text
    • http://mif-smeh.space/vegevi8tzuz.pdfIn PDF document text
    • http://stav-games.ru/woruvosuf0bsmk.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/wetevali/formel_reaktionsweg_lkw.pdfIn PDF document text
    • http://sowezenuvafe.epizy.com/juzogabolamafib.pdfIn PDF document text
    • https://s3.amazonaws.com/jikopot/botiwoxum.pdfIn PDF document text
    • https://5ce19dfa-329f-495d-88d1-e1e7834d9072.filesusr.com/ugd/d902bb_8b0f21a26e5c4094b06aa87053793b2a.pdf?index=trueIn PDF document text
    • https://44f68060-d5e3-4d58-b4e7-e3760392f352.filesusr.com/ugd/49488e_87009122f6e24bff8afef61f3c820ab9.pdf?index=trueIn PDF document text
    • http://diwedixeku.rf.gd/tadaruf.pdfIn PDF document text
    • http://toguxekedufu.epizy.com/nipapaxowafifeselakowese.pdfIn PDF document text
    • https://de461234-8179-4892-b46d-67dc01ae00af.filesusr.com/ugd/69bbc5_851a13a257ea47adb1820df20cfe1baa.pdf?index=trueIn PDF document text
    • http://zopetudivukuka.rf.gd/39847177048.pdfIn PDF document text
    • https://276658a2-c6b1-4a23-bc3b-56c82bce4278.filesusr.com/ugd/f9448a_db177195eaab4154aaa6cb7bf78f7de6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mefonevimimix/what_spine_arrow_do_i_need_for_recurve.pdfIn PDF document text
    • http://fukigokawim.epizy.com/english_bible_king_james_version.pdfIn PDF document text
    • https://2e5cbe44-7de3-4e3f-b94c-8a8567814465.filesusr.com/ugd/f96b02_a7bf7fd94b06480c86202d9ef7bdf3c8.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_off0000e35e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35E 5244 bytes
SHA-256: e466db65acab1280acf56175a4ce81a1948b41f9aab93df538f1697c7e46dce0
font_01_sfnt_off0000f550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF550 10812 bytes
SHA-256: 164302398f29b7b4322a31cccc845f50f4aa38cbb85c38f029663657929cdc4b

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