Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f8854d66c986e1c…

MALICIOUS

PDF

79.0 KB Created: 2021-04-21 06:17:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b3bbb6f5661ffd4b85c24d6d88cbdcb5 SHA-1: 2e56ddaf025e77bb45379959ba32fa6e3ae6e181 SHA-256: 4f8854d66c986e1cee5ce84b818f03aaea58597ac36bade2544f80ab6e8baf0c
96 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The embedded URL points to a suspicious domain, likely intended to host a malicious payload or redirect to a phishing site. The document body, though heavily obfuscated, suggests a lure related to 'experimental functional analysis examples'.

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://xezojetit.ru/strik?utm_term=experimental+functional+analysis+examples
    • http://misstourist.info/gutaduxajeromepeviwojitgu8.pdf
    • https://fivarebaxuru.weebly.com/uploads/1/3/5/3/135326201/3247410.pdf
    • http://mjawebdesign.net/what_is_the_cherokee_tribe_religionu12cs.pdf
    • http://getyourcredit.info/alma_chapter_58rktin.pdf
    • https://cdn.sqhk.co/xawefigi/hgnheyd/fatez_unturned_zombie_survival_free.pdf
    • https://static.s123-cdn-static.com/uploads/4367964/normal_5feb7eec26bd2.pdf
    • http://bigtittybella.com/wufenapegowetumaripz41l.pdf
    • https://xinufagepowe.weebly.com/uploads/1/3/4/4/134437511/7b53e36c5b1.pdf
    • http://supsun-aero.com/indurikar_nivrutti_maharaj_answer_keertane8tx1.pdf
    • https://cdn.sqhk.co/pavetikedur/dhhl6Jj/ariel_the_holistic_vocal_coach_dead.pdf
    • https://cdn.sqhk.co/womawuxinuge/hiahdWs/mystic_messenger_chat_room_times_day_2.pdf
    • https://muwikoli.weebly.com/uploads/1/3/2/7/132740525/lodojasiril.pdf
    • https://niguzagum.weebly.com/uploads/1/3/5/3/135390192/woziditifuguzapusu.pdf
    • https://static.s123-cdn-static.com/uploads/4456984/normal_5ff42e57a0930.pdf
    • http://lnstagrambusiness.com/solid_converter_unlock_codengdxl.pdf
    • http://chatik85939775.fun/buzatexurojasef0ug61.pdf
    • https://venunuwaxel.weebly.com/uploads/1/3/2/7/132740799/1375183.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/wovedukevikov/xuwafuduke.pdf
    • https://s3.amazonaws.com/tinajabizoreguf/newsletter_format_sample.pdf
    • https://s3.amazonaws.com/feborobegibew/44895681316.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb35.bin
d855664b34c80ac7184f1c417f6fd292dfccb080d6b04cc6ccb9097d1a499f0b
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB35 5168 bytes
font_01_sfnt_off0000fcb6.bin
dc8c21116b545827922efbf7ec224b4b4e037af41fce8450229c165b2bf708c8
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB6 10440 bytes
font_02_sfnt_off0001208b.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34
pdf-font-stream PDF embedded font (sfnt) at offset 0x1208B 4324 bytes