Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae870d61deaabc01…

MALICIOUS

PDF

76.7 KB Created: 2021-06-13 21:23:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: bbacf3c32d20f8b666da859975ee2499 SHA-1: 33ec00e871b5962e9879097f6ffefeb061773b8b SHA-256: ae870d61deaabc012ab149239c7bda61b4f2ee885dcb75507a71d2719e0dbf1a
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ClamAV and an ML classifier, indicating a high probability of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting it functions as a link farm designed to redirect users to potentially harmful websites. The document body, though heavily obfuscated, appears to be a lure related to "Macbeth pdf with line numbers", aiming to attract clicks through deceptive search result presentation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://pistant.ru/pbw?utm_term=macbeth+pdf+with+line+numbers PDF link annotation
    • https://telavepifamika.weebly.com/uploads/1/3/4/3/134352802/wezodavopebijo-komibosuxa-wivivanike.pdfIn PDF document text
    • https://jepololazatozuj.weebly.com/uploads/1/3/4/6/134601538/edd59d309711.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368767/normal_60645ba82630d.pdfIn PDF document text
    • https://sibuzowad.weebly.com/uploads/1/3/2/8/132814892/dagojixe_batesadagaxog.pdfIn PDF document text
    • https://lazoseroli.weebly.com/uploads/1/3/5/3/135316949/9032275.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406809/normal_5fe1b12ed3d09.pdfIn PDF document text
    • https://sebaderibegagib.weebly.com/uploads/1/3/4/5/134583030/d55c4a246.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393193/normal_6026eb983d123.pdfIn PDF document text
    • https://vetovevigu.weebly.com/uploads/1/3/4/4/134486276/2898145.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416144/normal_606233a8a2996.pdfIn PDF document text
    • https://xilazugalalurid.weebly.com/uploads/1/3/4/6/134685369/585238.pdfIn PDF document text
    • https://pudewufaziv.weebly.com/uploads/1/3/0/7/130739775/177c81.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kedetuwi.pbworks.com/f/sebinewejasodimo.pdfIn PDF document text
    • http://bupataved.pbworks.com/f/36176414745.pdfIn PDF document text
    • http://wuxikadafi.pbworks.com/w/file/fetch/144414201/resignation_letter_format_in_marathi.pdfIn PDF document text
    • http://padimagofo.pbworks.com/f/jenebepuvewin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b503753e-5584-43c7-b87e-3b274b091be9/how_to_escape_bitlife_max_prison.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35938d87-66d1-4021-b4ce-a0bd128e5324/how_to_draw_manga_book_barnes_and_noble.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8026b7f-39ea-40ce-a58c-c38c56aa9d72/what_is_service_oriented_architecture_in_simple_terms.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_off0000ec12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC12 5632 bytes
SHA-256: 724dc40642ace4eb5e6068fda282bc0e60a0fd39c51cad6c26b4981d100042b7
font_01_sfnt_off0000ff23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF23 10876 bytes
SHA-256: 1f9ebe90e6812f95724274acf2c661225d08d932d6e9761c093b4c4ff41bdb32

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