Malicious PDF — malware analysis report

Static analysis result for SHA-256 71a23ae82298385f…

MALICIOUS

PDF

90.6 KB Created: 2021-03-30 09:56:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 746578f719c6b714d44ed875fd02e10b SHA-1: b3092813ca9748e3133f67d9051e865c86dee567 SHA-256: 71a23ae82298385f368a5f162588acda8c2a1dd79f2dfe89860c252fc21de64c
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to disposable hosting or potentially malicious domains, suggesting a link farm designed to redirect users to harmful content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/award?keyword=bildungsroman+characteristics+pdf PDF link annotation
    • http://vipimuxatomefi.medianewsonline.com/losikebi.pdfIn PDF document text
    • http://pornbustyvids.com/75188747184w9up8.pdfIn PDF document text
    • http://idealslimitalia-ufficiale.site/930048915092bmb6.pdfIn PDF document text
    • https://cdn.sqhk.co/vanewano/xgdihhh/game_daddy_was_a_thief_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/nomuzali/jdtMjfK/hashtags_for_instagram_photography_page.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407057/normal_60612348ca683.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465397/normal_5fdbc9de10448.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417813/normal_5fc915895c93f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481830/normal_603d8ee3e7225.pdfIn PDF document text
    • http://neuroncraft.online/57357190917qo89v.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401723/normal_6054cec8a5a76.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tofalit.myartsonline.com/96058291744.pdfIn PDF document text
    • https://s3.amazonaws.com/tofizo/bharatha_rajyangam_in_telugu.pdfIn PDF document text
    • https://728bf1be-24e3-4891-ba98-fedceca1a503.filesusr.com/ugd/3268c8_664432e20ed54000a1787f340d03a8f9.pdf?index=trueIn PDF document text
    • https://8f1c0ae7-1ba6-4c51-a623-4d29f5e3aebb.filesusr.com/ugd/c1615c_470444d4ace546629d9bfefbb1738193.pdf?index=trueIn PDF document text
    • https://aefbb2f1-1cfc-4a48-aab2-d72547d84173.filesusr.com/ugd/2f3ac6_5ebd2a37fdd7409ba4d604c9e9647595.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fokapikow/how_to_pronounce_french_words_phonetically.pdfIn PDF document text
    • https://d67926d6-99fe-48a4-938f-95006fdf2de6.filesusr.com/ugd/21d82e_5ddfad235a684b3ea326f5e77ed07f85.pdf?index=trueIn PDF document text
    • http://sivikonalijuto.myartsonline.com/annie_full_play_script.pdfIn PDF document text
    • https://s3.amazonaws.com/polexebuj/shallow_piano_free_sheet_music.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011e17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E17 5616 bytes
SHA-256: 42321d463f2a93238cb66bc9d2117594a4d745c62c358a967bd8bfbdbe446d35
font_01_sfnt_off0001310a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1310A 14040 bytes
SHA-256: 05bddffa9fc754f4d21b118c1b19e7f26801e845a60e815ee3b7a8a484dbfa6b

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