Malicious PDF — malware analysis report

Static analysis result for SHA-256 168b7ef42d650083…

MALICIOUS

PDF

87.8 KB Created: 2021-03-01 22:19:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: f1c96569ff4b29ffaf86869930d83d06 SHA-1: 897ff80315fcf4823fe8e9535686d896926af9bb SHA-256: 168b7ef42d65008364ac30e16b3a46768481241104f31eb7f37a6d292c57b32a
126 Risk Score

Malware Insights

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

The PDF document was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious content. It contains numerous embedded URLs pointing to disposable domains and link farms, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, appears to be a lure related to 'architectural drawing drafting table', likely to trick users into clicking the malicious links.

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://nipisod.ru/strik?utm_term=architectural+drawing+drafting+table PDF link annotation
    • https://patoduwewoz.weebly.com/uploads/1/3/1/4/131483118/mupudakubazibik.pdfIn PDF document text
    • https://viwoxinuzozaxa.weebly.com/uploads/1/3/1/6/131636825/46af6c9bf.pdfIn PDF document text
    • https://cdn.sqhk.co/fovuxugo/Adidiit/jezerasemenugamisat.pdfIn PDF document text
    • http://trudogoliya.online/life_and_books_and_everything_season_2b4u20.pdfIn PDF document text
    • https://fijapirugonobi.weebly.com/uploads/1/3/4/3/134315317/41041c56c15.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413362/normal_5fdee5bbc46e5.pdfIn PDF document text
    • https://vekoduxiboba.weebly.com/uploads/1/3/1/3/131398498/991533.pdfIn PDF document text
    • http://iminn.ru/39513839225i5o2j.pdfIn PDF document text
    • http://znakomstva18x.site/3938880200755xdf.pdfIn PDF document text
    • http://fevinoreniwelik.sportsontheweb.net/85112471936.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407064/normal_6022b41a0f080.pdfIn PDF document text
    • http://christmas-gift.ru/bogexiki7a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464871/normal_603c6ba719659.pdfIn PDF document text
    • https://balesiloruj.weebly.com/uploads/1/3/4/6/134671801/gaduxezuzivifomab.pdfIn PDF document text
    • http://kfnwejfnkwheklf.space/macys_bed_sheets_king_sizeovr5w.pdfIn PDF document text
    • http://datingsexchat.site/pizomokilofiwepixwuos1.pdfIn PDF document text
    • http://gayerkan.com/97153754616m6e06.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476952/normal_5fddba5ee12e1.pdfIn PDF document text
    • http://strapslap.online/you_raise_me_up_sheet_pianoj5cif.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00011b73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B73 5328 bytes
SHA-256: 9a9b34f1c15973610ec4d6b54a4a2895fb2170bdbbd4af5ad2af6cc25d3027b8
font_01_sfnt_off00012da0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DA0 10688 bytes
SHA-256: 7b50a03b16f0008d34343eb83727fbe466ada5940fc4a916ee06bd30ccb90849

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