Malicious PDF — malware analysis report

Static analysis result for SHA-256 39cc8e9b38af92b0…

MALICIOUS

PDF

68.8 KB Created: 2021-02-18 01:23:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 856361b769c33d187c0c0bc3f365bc28 SHA-1: 36bf68af23d4f0e22334889837e54e4d5b0aa509 SHA-256: 39cc8e9b38af92b097f0414f025cffb83d3aa2c8b245bff534cadc1a26c82204
116 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating a callback phishing lure. The document body, though heavily obfuscated, suggests a context of technical support or billing issues, prompting the user to call a number. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a phishing attempt, likely delivered as a spearphishing attachment.

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
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/wix?keyword=generalaire+sl16+humidifier+manual
    • https://static.s123-cdn-static.com/uploads/4379038/normal_5fff62293d47f.pdf
    • https://cdn-cms.f-static.net/uploads/4447487/normal_600ed8c7209e6.pdf
    • https://static.s123-cdn-static.com/uploads/4424024/normal_5ff8b76fcfd0e.pdf
    • https://static.s123-cdn-static.com/uploads/4402261/normal_5fe1693e433ba.pdf
    • http://morj.space/muzofezesidedei5q5e.pdf
    • https://static.s123-cdn-static.com/uploads/4404966/normal_5ffdba593daf8.pdf
    • https://static.s123-cdn-static.com/uploads/4464871/normal_5fca8f945ba5a.pdf
    • https://cdn-cms.f-static.net/uploads/4405929/normal_60214ff7d337d.pdf
    • http://pro-komp-master.website/60425336310tvqk4.pdf
    • https://cdn-cms.f-static.net/uploads/4472208/normal_601b439bced89.pdf
    • http://aromaita.space/68619607499kavoc.pdf
    • http://fofodabigejobe.22web.org/install_apk_using_bluestacks.pdf
    • http://maletewidulebil.iblogger.org/nuvijikexunevide.pdf
    • http://xalisuvo.22web.org/formation_body_mind_centering_france.pdf
    • https://cdn-cms.f-static.net/uploads/4451212/normal_5fd903c86b157.pdf
    • http://kubikox.iblogger.org/13589786999.pdf
    • http://sodahq.pro/78251682339ismib.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://digimoxesimukus.rf.gd/human_anatomy_marieb.pdf
    • http://negeguragifijem.rf.gd/how_to_use_the_accu-chek_softclix_lancing_device.pdf
    • http://rododibez.epizy.com/8493182233.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfca.bin
9dfc410ad71caaf60750e3fb0ccdbbbdb3a120ff69f3f3c7ae706cf17ef8b194		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCFCA 5384 bytes
font_01_sfnt_off0000e1ef.bin
42c4efa5b20b7cb9e2a8219001d3893dc5a653137710edcbdb63edb400d9430c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1EF 10392 bytes

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