Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cf3faec40dc1ed1…

MALICIOUS

PDF

75.9 KB Created: 2021-03-29 07:49:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 25184f28730bf7d028a1ce19ae0c7103 SHA-1: 81f0fbd2edf80c128d945d8d548d06969d6e6b61 SHA-256: 9cf3faec40dc1ed197b807bf257afd4181404aaa4297a438a0728f4b124e2d43
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'pelibifir.ru', which is likely used to host a phishing page or distribute further malware. The document body, though heavily obfuscated, suggests a lure related to 'container tracking system pdf'. No scripts were extracted, but the PDF structure itself facilitated the malicious redirection.

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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/award?keyword=container+tracking+system+pdf PDF link annotation
    • https://cdn.sqhk.co/bivotiboma/BRCgep7/livro_os_carbonrios.pdfIn PDF document text
    • https://cdn.sqhk.co/jagugide/9LjdRjh/fruit_dash_mod_apk_noclip.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445544/normal_5fe0474c1c809.pdfIn PDF document text
    • http://zaparipajomigi.scienceontheweb.net/alteryx_designer.pdfIn PDF document text
    • https://cdn.sqhk.co/nisugewameru/5yjaiii/64425451112.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388279/normal_5fd61b2e777bc.pdfIn PDF document text
    • https://cdn.sqhk.co/fedefuxu/Edhbjia/the_silent_age_game_wiki.pdfIn PDF document text
    • http://fonivoguko.medianewsonline.com/goxali.pdfIn PDF document text
    • https://cdn.sqhk.co/gasawivu/hcicxhh/dense_rank_in_webi_report.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4528959/normal_600576268a541.pdfIn PDF document text
    • http://gukivuzijisuva.getenjoyment.net/penatalaksanaan_fisioterapi_pada_carpal_tunnel_syndrome.pdfIn PDF document text
    • http://talajifit.mywebcommunity.org/the_history_of_love_book_download.pdfIn PDF document text
    • http://viwafuxofiseko.getenjoyment.net/calidad_ambiental_en_colombia.pdfIn PDF document text
    • https://cdn.sqhk.co/xafeperale/gEjfhim/20458660291.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ab4b0d6-250e-4ab2-9738-563e8e1fed5d/56503658906.pdfIn PDF document text
    • https://s3.amazonaws.com/loxopudizus/tasunosugupusefijirepi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0f2ad22-f112-4ddc-826d-4aea9e34a513/gowogagezilofaranex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/797cfa2e-50f7-40c5-8014-265603b74119/10180234885.pdfIn PDF document text
    • https://s3.amazonaws.com/najubu/83632058909.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_off0000ebc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC8 5516 bytes
SHA-256: 11a2ac16af2accb3d492979e4b1b31269e0313e594a0632d2fe2773f91053e5f
font_01_sfnt_off0000fe82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE82 10724 bytes
SHA-256: 35bffb4413a02e09a0640d00433d2c40efd774704ee3fc965bfd08b17f116af3

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