Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d32cfbfea299d24…

MALICIOUS

PDF

83.2 KB Created: 2021-01-22 12:42:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 63453db2161f15011b0438299425d79c SHA-1: e56a42c05409160ea1bf1453da1c3c7b2825d0b4 SHA-256: 1d32cfbfea299d2418713fdcc73b6aed68b832a643ed313454e19dd04b09a7e7
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO scam. The ML classifier strongly flagged this PDF as malicious. The document body is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf, but no executable scripts were extracted.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://jacksth.ru/123?utm_term=candito+linear+program PDF link annotation
    • https://biwomewiwuxe.weebly.com/uploads/1/3/4/1/134131409/18ebebb46.pdfIn PDF document text
    • https://cdn.sqhk.co/jalizovi/gcCVigc/thriftbooks_reviews_indeed.pdfIn PDF document text
    • https://xuzatikanuji.weebly.com/uploads/1/3/0/7/130775198/46e8aa62.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410415/normal_5feaf186c93a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405922/normal_600a4d245c171.pdfIn PDF document text
    • https://defiduzumuxel.weebly.com/uploads/1/3/2/6/132682342/tatebaxagilupa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385213/normal_5fca406793ee7.pdfIn PDF document text
    • https://cdn.sqhk.co/wajuvimavofo/3Pghiij/83332712212.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369651/normal_5feaefd6d5df0.pdfIn PDF document text
    • https://cdn.sqhk.co/kenipafitu/5Aghzhc/car_shifter_cover.pdfIn PDF document text
    • https://cdn.sqhk.co/gitopedevid/ijehhYi/66489552979.pdfIn PDF document text
    • https://lifexusubanipi.weebly.com/uploads/1/3/4/3/134377686/6704034.pdfIn PDF document text
    • https://dajitogaxafolix.weebly.com/uploads/1/3/1/1/131164176/felufafewukusobig.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lelekon.epizy.com/play_script_template.pdfIn PDF document text
    • http://dimegebewode.epizy.com/sanebatisesiwid.pdfIn PDF document text
    • http://wonumamirevaz.rf.gd/asphalt_8_hack_ios_no_survey.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_off00010a68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A68 5008 bytes
SHA-256: 3a4fbc1dd63c36ff9b22d3a1c7e4df58e3a718b56ca6d4b64076cf21211193bc
font_01_sfnt_off00011b53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B53 11036 bytes
SHA-256: 1204bf9cc244baebbc32d2753b184f860bbadc6308c2724b6de5cd9646324d22

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