Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bf398bad0046c52…

MALICIOUS

PDF

97.4 KB Created: 2021-05-05 11:09:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: bc06a528c88112f114f81bb45fdb7632 SHA-1: b26e9b3ec0469c299dd6d86f6d1d9a4395ce1ff8 SHA-256: 3bf398bad0046c52b849d3032a263362ee9ee8143c444cd5247ed34aa87884b2
136 Risk Score

Malware Insights

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

The PDF contains a lure related to 'Singer commercial sewing machine 31-15' and a high-risk heuristic indicating it's an image lure linking to an SEO redirector for phishing. The ML classifier and ClamAV also flagged this PDF as malicious. The embedded URL leads to a suspicious domain, likely part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://seumenha.ru/strik?utm_term=singer+commercial+sewing+machine+31-15 PDF link annotation
    • http://pakawuwujawo.getenjoyment.net/budget_2020.pdfIn PDF document text
    • https://mipirizu.weebly.com/uploads/1/3/2/6/132682564/xezoxutobimizom.pdfIn PDF document text
    • http://fidofawi.medianewsonline.com/aoac_methods_for_proximate_analysis.pdfIn PDF document text
    • http://rowowesofazov.medianewsonline.com/wonobolik.pdfIn PDF document text
    • http://nemugub.mywebcommunity.org/58711940982.pdfIn PDF document text
    • https://pelunukemuf.weebly.com/uploads/1/3/0/7/130776607/dafesovi.pdfIn PDF document text
    • https://jabenawonidibe.weebly.com/uploads/1/3/5/3/135385032/wabazado.pdfIn PDF document text
    • https://rowusebejaron.weebly.com/uploads/1/3/1/6/131637242/460cc.pdfIn PDF document text
    • http://futuroke.iblogger.org/dufogujipavozabedabokatek.pdfIn PDF document text
    • http://tafuxasomup.getenjoyment.net/82204708048.pdfIn PDF document text
    • http://desenusexewu.iblogger.org/dipubokogokazuvusofiraj.pdfIn PDF document text
    • https://wubajepetodol.weebly.com/uploads/1/3/1/6/131606368/zufudimirodazemove.pdfIn PDF document text
    • http://dorulezebum.sportsontheweb.net/active_listening_in_counselling.pdfIn PDF document text
    • https://gonewama.weebly.com/uploads/1/3/4/0/134095907/b3b62e.pdfIn PDF document text
    • https://moduruwili.weebly.com/uploads/1/3/2/7/132710657/da47b485ac3e.pdfIn PDF document text
    • https://mulofujuxemo.weebly.com/uploads/1/3/0/8/130874025/rifopaguwu_zesunazis.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/toniseligiwuzux/list_of_vowels_and_consonants_english.pdfIn PDF document text
    • https://s3.amazonaws.com/vapelurowar/najuw.pdfIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/arduino_c_programming_book.pdfIn PDF document text
    • http://rosajeku.myartsonline.com/manual_camtasia_9_portugues.pdfIn PDF document text
    • http://xirexadugimog.atwebpages.com/xifitixiwutebukote.pdfIn PDF document text
    • https://s3.amazonaws.com/difigomisosak/galvus_tem_metformina.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_off00013d94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D94 5780 bytes
SHA-256: 651a41d827ff154ee6fc5f797d9633c010b8e186ff6721a49d006398ae885d58
font_01_sfnt_off00015134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15134 11384 bytes
SHA-256: 28309d10649850f24632d0d91f6eb13769eac391db125e319b8cfdbfefd51f92

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