Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb854b5fdb59b5a1…

MALICIOUS

PDF

78.8 KB Created: 2021-03-20 07:01:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: af056cfc52acc1f4b42781df70e6a116 SHA-1: de7362db902ede2ddf7de1d7f94b0f0089c89252 SHA-256: cb854b5fdb59b5a12ab92a2cbf82f96633b953fe3d4a4c3085c21f8a3661ed39
96 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains an embedded URI pointing to 'nipisod.ru', which is likely part of a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URI suggest it's designed to trick users into navigating to a malicious site.

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://nipisod.ru/award?keyword=human+anatomy+pdf+atlas
    • https://cdn-cms.f-static.net/uploads/4493201/normal_602aae50056f5.pdf
    • http://bestsalestoday.xyz/canon_eos_rebel_xs_1000d_memory_card4z94j.pdf
    • http://nuxuzuruguli.mypressonline.com/ludenilababesub.pdf
    • http://barbanapoli.moscow/blitz_brigade_gameplay_androidueyr3.pdf
    • https://cdn.sqhk.co/nepelusir/ijggjaf/octopussy_james_bond.pdf
    • https://cdn-cms.f-static.net/uploads/4416656/normal_603a0b5ec6954.pdf
    • http://mevukavotidu.getenjoyment.net/19033030998.pdf
    • http://milanbeach.fun/marginal_costing_formatzrwcg.pdf
    • https://static.s123-cdn-static.com/uploads/4375531/normal_60043790cb8f0.pdf
    • http://verification-help.com/3339426335ysf6q.pdf
    • https://cdn.sqhk.co/zirigajer/gDQiaha/injustice_gods_among_us_all_skin.pdf
    • http://zoluwofemofuper.sportsontheweb.net/tugafudu.pdf
    • http://fudazozotakaxal.mywebcommunity.org/57341869815.pdf
    • https://cdn.sqhk.co/rawavuzom/WSujhgj/cm_rewards_app_apple.pdf
    • http://govovimifakine.mywebcommunity.org/32657123244.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://tafiwepamubov.atwebpages.com/16039756352.pdf
    • https://s3.amazonaws.com/punagilelabon/davimijerexoxifana.pdf
    • http://madigekole.onlinewebshop.net/present_simple_adverbs_of_frequency_worksheet.pdf
    • https://s3.amazonaws.com/rewepalazamiso/62518607774.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_off0000e9cc.bin
27d4966332b8971c4e4c4efa2aa77049027a34db0b33858724a1abfc2c31458b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CC 4868 bytes
font_01_sfnt_off0000fa44.bin
58d89b241a5b9cb9b845fc94c67e51ccf506d3619a5a266b231c794d2332a5e4
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA44 11108 bytes
font_02_sfnt_off00011fdc.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FDC 4324 bytes