Malicious PDF — malware analysis report

Static analysis result for SHA-256 221b727bd2fe44d3…

MALICIOUS

PDF

68.0 KB Created: 2021-03-04 07:22:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: f6c279f75bc2d159a1538051678a892d SHA-1: d93674c1d447d7fcc40fd8f421213ce44e29c03d SHA-256: 221b727bd2fe44d33c4a007d962547ab5d77cdea3c0885fea476100736634e63
96 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, specifically as a phishing trojan. It contains an embedded URL that directs users to a suspicious domain, likely for credential harvesting or malware delivery. The document body, though heavily obfuscated, appears to be a lure related to a scientific question, which is a common tactic for phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/strik?utm_term=what+kind+of+intermolecular+forces+does+h2o+have PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4392659/normal_5fe540fca30ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452386/normal_60402065537b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467300/normal_5fd1014d69918.pdfIn PDF document text
    • https://cdn.sqhk.co/lunosupi/e5jf4KL/bevexapigalumub.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455669/normal_5fc5849aea30c.pdfIn PDF document text
    • https://mipapipav.weebly.com/uploads/1/3/4/0/134012398/40d5369cea356.pdfIn PDF document text
    • https://cdn.sqhk.co/legikowe/ggxjihj/basketball_battle_play_for_free_online.pdfIn PDF document text
    • https://puzepoxa.weebly.com/uploads/1/3/4/3/134318678/guxajisamizuvunodex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498997/normal_601d2361a25e0.pdfIn PDF document text
    • https://cdn.sqhk.co/fewibefanid/hhQybjd/promo_game_free_fire_offline.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480756/normal_60281962441ee.pdfIn PDF document text
    • https://cdn.sqhk.co/gimexigerub/hgid1hf/winter_storm_iowa_today.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393901/normal_6013077344e72.pdfIn PDF document text
    • https://cdn.sqhk.co/kejopala/hdidign/migenobomarul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366980/normal_600d8ec6d7df6.pdfIn PDF document text
    • https://cdn.sqhk.co/bikegola/gJhcggd/mobudep.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454547/normal_5ffde258b4220.pdfIn PDF document text
    • https://cdn.sqhk.co/tirewaku/b8tcahf/shooting_hunter_3d_game_download.pdfIn PDF document text
    • https://vezidinudavad.weebly.com/uploads/1/3/4/4/134481570/a581ebe31a0af31.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000cb9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB9A 5532 bytes
SHA-256: 60ae55670556adadf414113ea69efcd44a87d8fee189bd31274071d51fc5075a
font_01_sfnt_off0000de51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE51 10696 bytes
SHA-256: a14dc9c8fe27d9aaae5fab182b2a31468ac4d3c0a1ccefd5e59ac60ac6d66239

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