Malicious PDF — malware analysis report

Static analysis result for SHA-256 42397a0421cc7a7d…

MALICIOUS

PDF

81.2 KB Created: 2021-03-29 22:20:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 1f09110f5dbbd9fd8ea42f65585c7a1b SHA-1: b254bf730e33406aeb9ce47dd16d09ed108fbbf0 SHA-256: 42397a0421cc7a7de66cd31f0b42f391e41773b7077f520683f9e635045d976e
186 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xajibur.ru/aws?utm_term=kurzweil+pc88+specs PDF link annotation
    • https://rejileju.weebly.com/uploads/1/3/4/3/134335231/puwigarekutowozi.pdfIn PDF document text
    • https://nililekekikare.weebly.com/uploads/1/3/0/7/130739967/jixafakedatevo-lijetunowan-taxalanimuw-rininat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485152/normal_6050e4154437c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370768/normal_601f4266dfe02.pdfIn PDF document text
    • https://gusumumonabol.weebly.com/uploads/1/3/0/7/130775475/8999160.pdfIn PDF document text
    • https://vuduxedife.weebly.com/uploads/1/3/5/3/135337585/6497284.pdfIn PDF document text
    • https://fupakukenig.weebly.com/uploads/1/3/4/2/134234610/lobukarizevupup_pawimevatawu_ruwemodipuve.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452865/normal_5fc62328833b9.pdfIn PDF document text
    • https://kavavori.weebly.com/uploads/1/3/4/0/134012315/6639403.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481839/normal_60043eb425f57.pdfIn PDF document text
    • https://nesavelo.weebly.com/uploads/1/3/2/3/132303009/ee38d7.pdfIn PDF document text
    • https://dulewexafup.weebly.com/uploads/1/3/4/7/134702005/tedotigu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417531/normal_6057de342a65b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484631/normal_604152794a8bd.pdfIn PDF document text
    • https://pananufizusa.weebly.com/uploads/1/3/4/4/134445813/vejanenapogipaxupige.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/dalava/24832113148.pdfIn PDF document text
    • https://s3.amazonaws.com/vofadoloves/macroeconomics_crash_course_economics_5_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/dorulusof/binupurijopejudovamidol.pdfIn PDF document text
    • https://s3.amazonaws.com/vebenok/adobe_photoshop_cs6_star_brushes_free.pdfIn PDF document text
    • https://s3.amazonaws.com/wukevirenesu/aetna_accident_insurance_claim_form.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_off00010239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10239 5024 bytes
SHA-256: 5a6b2f7c8ac2fcf71f9070e43653d4d5306eecaadf3c4bc09eab79ee0cb7140a
font_01_sfnt_off00011385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11385 10592 bytes
SHA-256: 3b82330376df77323d8b88f4ef01273157eca14021d8031d71152cc19febc18c

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