Malicious PDF — malware analysis report

Static analysis result for SHA-256 87dd8f0452102b54…

MALICIOUS

PDF

73.6 KB Created: 2021-01-19 11:53:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: c05bb9c6a0f6163b3b62632777fc4a72 SHA-1: a24e03930e126c25a55a34aa130b1ac3c7ae9221 SHA-256: 87dd8f0452102b545f6eebeec0d673892e774931f720470221ab3562db747f81
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/123?utm_term=stock+watson+introduction+to+econometrics+4th In PDF document text
    • https://cdn.sqhk.co/kafekata/CQUpjbw/irritable_bowel_syndrome_upper_left_abdominal_pain.pdfIn PDF document text
    • https://fedalovojuxunod.weebly.com/uploads/1/3/0/7/130775560/f8afc2fe0214415.pdfIn PDF document text
    • https://jugurapofan.weebly.com/uploads/1/3/4/3/134339640/6135250.pdfIn PDF document text
    • https://lukozosa.weebly.com/uploads/1/3/4/4/134485969/4705434.pdfIn PDF document text
    • https://site-1249342.mozfiles.com/files/1249342/reforma_do_big_ben_2018.pdfIn PDF document text
    • https://cdn.sqhk.co/tefozakozup/jgijih4/ballpoint_pen_refills_plastic.pdfIn PDF document text
    • https://jewadasin.weebly.com/uploads/1/3/4/6/134604584/5495907.pdfIn PDF document text
    • https://ronumotesagazuw.weebly.com/uploads/1/3/4/3/134373959/9903968.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424662/normal_5ffed049ceb9d.pdfIn PDF document text
    • https://site-1166659.mozfiles.com/files/1166659/facts_about_space.pdfIn PDF document text
    • https://cdn.sqhk.co/fuwifemi/EidJ5OU/bopibezinugaxodipa.pdfIn PDF document text
    • https://roluliduz.weebly.com/uploads/1/3/4/7/134771057/6674359.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460460/normal_5fa8be79ca501.pdfIn PDF document text
    • https://luzulobopado.weebly.com/uploads/1/3/2/6/132681737/bilebejijuzaxo.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/legapatatezisa/vezimine.pdfIn PDF document text
    • https://s3.amazonaws.com/fedojigudaj/nodudevarujapasarutezab.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwuxot/segarunan.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_off0000dfb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB7 5496 bytes
SHA-256: 0023b259635b05d18272683d2abb58908476dc2da9c77aee75ea56ed6fc536da
font_01_sfnt_off0000f259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF259 11604 bytes
SHA-256: 12c1e2b01f459cf66d98132e62eb5d6c4c2385609a125a0d442702eab738283c

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