Malicious PDF — malware analysis report

Static analysis result for SHA-256 8257b242a10f2afe…

MALICIOUS

PDF

72.1 KB Created: 2021-04-01 20:16:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: d7b9e0ba7d0a3023711c405b6848aae5 SHA-1: caf6550b660cfd7acecd99b716560c64386944a7 SHA-256: 8257b242a10f2afedd7a4bafd2162ddf33c2350f0681ac39c1b9e86f2319d8d9
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. The embedded URLs are likely used to redirect users to malicious sites, potentially for credential harvesting or malware distribution.

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://druttle.ru/wix?keyword=landice+l7+pro+trainer+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413462/normal_600d8c22ba3c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446019/normal_605de525bb76c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416319/normal_603b0ab20fa17.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391315/normal_6065056e88d7b.pdfIn PDF document text
    • https://fabezetenonuke.weebly.com/uploads/1/3/4/8/134846610/c46ffca0.pdfIn PDF document text
    • https://linerebe.weebly.com/uploads/1/3/0/8/130813546/desofukodudoxu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481163/normal_5fe0593d70b29.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375209/normal_6060f0110f982.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462697/normal_604cd97cbd584.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485823/normal_600825fad77ab.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1b2c4efd-c8eb-4b04-b26f-b9154d704720.filesusr.com/ugd/d3758e_28013e3e1c5f460ab52bfb496ddcd358.pdf?index=trueIn PDF document text
    • https://8fc1c2d6-49ba-4d63-8b95-0327ef2b1627.filesusr.com/ugd/1849a1_2110778ecc7e47a99331d57ae244db1a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pibabopuduj/19839433508.pdfIn PDF document text
    • https://cf176ec6-4820-456b-adf9-61e5f06c968f.filesusr.com/ugd/43d598_18c6c3378c984178bf039ee72c522464.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jonora/12324368934.pdfIn PDF document text
    • https://s3.amazonaws.com/jewizopukuni/the_everything_candida_diet_book.pdfIn PDF document text
    • https://s3.amazonaws.com/muvevanepen/how_much_is_a_hoveround_wheelchair.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

Related samples 2

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC21 5064 bytes
SHA-256: e69a7712479dcd79cd626ca3333cd97910e91110a01fe58379b5da94b24b4917
font_01_sfnt_off0000ed4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4F 10688 bytes
SHA-256: 29cc7227022920afe8e292daf5ee3359a2728d4efbe0eb37feea0bd66a135b14

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