Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7c91d94c449f362…

MALICIOUS

PDF

74.2 KB Created: 2021-03-15 10:54:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 771a4cd6a3866b1f364dd2b13038591e SHA-1: 08727a0ff7baae1c788a0b4d76169f5511d83307 SHA-256: a7c91d94c449f362b61b21771b23144d74b28f1d500b52fc45b6c990252f8504
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with at least one pointing to a domain associated with link farming and disposable hosting, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, appears to be a lure related to search results for a PDF document.

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://pelibifir.ru/award?keyword=basic+concepts+of+islamic+economic+system+pdf PDF link annotation
    • https://vigagexagadip.weebly.com/uploads/1/3/1/8/131856194/movito.pdfIn PDF document text
    • https://jorojiwelipevo.weebly.com/uploads/1/3/5/3/135393556/zimiboxagek.pdfIn PDF document text
    • https://cdn.sqhk.co/bonosexov/highf1U/play_last_card_online_freecell.pdfIn PDF document text
    • https://cdn.sqhk.co/dejuxafe/dicqIii/84929851029.pdfIn PDF document text
    • https://cdn.sqhk.co/pirasemofoge/ytIh4ii/does_he_like_me_signs_on_snapchat_quiz.pdfIn PDF document text
    • https://giretalude.weebly.com/uploads/1/3/4/6/134677333/712320.pdfIn PDF document text
    • http://subfamjtii.site/will_cyberpunk_be_censored_on_ps4us5da.pdfIn PDF document text
    • http://myimperfectmomlife.com/what_opens_dwg_filesanjzw.pdfIn PDF document text
    • http://mantenancie.com/951284864036bdyb.pdfIn PDF document text
    • https://cdn.sqhk.co/nulegudup/ggGgiij/cash_flow_free_app.pdfIn PDF document text
    • https://cdn.sqhk.co/fotusonetagu/ighhgiE/pexaxi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9ef77391-fdd1-48d8-ba15-364b07375333.filesusr.com/ugd/ebefdf_7bb31a2c70434689a132d539b3a223a0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5df1cd7-c21b-4c68-9171-f3ec6044ff9d/61888294645.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b798538-82ea-49ee-91b4-80c8cd1e11b7/movilizatolilafeviz.pdfIn PDF document text
    • https://43a2ba88-5de9-465b-b95f-6a4d82f2d06e.filesusr.com/ugd/dcbeda_0e06a96690414ee4b1fc2e7b6fe753f6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fulazelof/48017948642.pdfIn PDF document text
    • https://s3.amazonaws.com/pigolo/shallow_lady_gaga_sheet_music_piano.pdfIn PDF document text
    • https://s3.amazonaws.com/selivuvumepaveb/bepizumasegarabuki.pdfIn PDF document text
    • https://s3.amazonaws.com/padosumifubobo/libro_man_myth_messiah_en_espaol.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_off0000e508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE508 5356 bytes
SHA-256: 257ea8f60d3132c7ed125571558f595126501474c1cc058101f81d7e2aa13ded
font_01_sfnt_off0000f741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF741 10764 bytes
SHA-256: 7e02ddf2da22d08edbec2df51083287b4bfeb1b9b4c6059cd1e81251ec85151a

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