Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c8031f6e3962df0…

MALICIOUS

PDF

78.1 KB Created: 2021-04-09 01:23:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 0db1eb44e9bbfdf41bc05ceaad8e30ab SHA-1: ad10687049ca929c58afa9a642ac9e4417846998 SHA-256: 2c8031f6e3962df0f2d18d5b23bff1dbd196a4b509b48ccd30c9a7c18c78447b
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The embedded URL, https://pelibifir.ru/strik?utm_term=internal+audit+course+pdf, is likely the primary mechanism for delivering the malicious payload. Although no scripts were explicitly extracted, the PDF structure and the presence of external URIs suggest an attempt to exploit the user's trust through a deceptive document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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=internal+audit+course+pdf PDF link annotation
    • https://cdn.sqhk.co/begokaxawip/bp0hg6I/football_trading_cards_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/wagomito/0icgihd/record_live_streaming_video_software_free.pdfIn PDF document text
    • http://lazirawolewok.getenjoyment.net/sportcraft_turbo_air_hockey_table_parts.pdfIn PDF document text
    • http://pedufan.iblogger.org/ciencia_moderna_definicion.pdfIn PDF document text
    • https://cdn.sqhk.co/jowapezo/hidQgc0/tower_defence_online_warcraft.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469827/normal_5fe7615d2e8f0.pdfIn PDF document text
    • https://cdn.sqhk.co/xodegajeriw/yihieha/artarmon_public_school_uniform_shop.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419832/normal_5ff3811fa2fd7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387031/normal_6019f1e088718.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457008/normal_600aa8a3c8a20.pdfIn PDF document text
    • https://cdn.sqhk.co/datawafag/gdWhjhh/easy_portuguese_cod_fish_recipes.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tasopawak.rf.gd/kifodinifowo.pdfIn PDF document text
    • http://ligoroxenafof.atwebpages.com/68732743892.pdfIn PDF document text
    • https://s3.amazonaws.com/lejivugeleguwod/holy_tamil_bible_app_free.pdfIn PDF document text
    • https://s3.amazonaws.com/gajakelegeza/wow_freakz_assassination_rogue_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/daraniwekamidir/90912617032.pdfIn PDF document text
    • http://situwosase.myartsonline.com/casio_g-shock_rangeman_gps_solar_gpr-b1000-1er.pdfIn PDF document text
    • https://s3.amazonaws.com/patilawasu/58717037356.pdfIn PDF document text
    • https://s3.amazonaws.com/faluzotixupi/mofozofanufudaxotanij.pdfIn PDF document text
    • https://s3.amazonaws.com/kalanejaxutilif/20008394026.pdfIn PDF document text
    • https://s3.amazonaws.com/mevuzokekenojab/3544294706.pdfIn PDF document text
    • https://s3.amazonaws.com/semuxemakaw/61235447820.pdfIn PDF document text
    • https://s3.amazonaws.com/rizoli/birthday_flower_images_hd.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_off0000f2a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A7 5088 bytes
SHA-256: 8ca804490fa333c6876d581340c158280b92b8eb3b1dc2839f749626a1650754
font_01_sfnt_off00010400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10400 11564 bytes
SHA-256: c56f8e5eb31676a5bf4f5f4d68928e1d69287bbfd69887d993035d8b19a0e446

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