Malicious PDF — malware analysis report

Static analysis result for SHA-256 f171e21d1601902b…

MALICIOUS

PDF

71.6 KB Created: 2021-01-27 13:00:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 11c2302614fb3efe8fb958c5af14f192 SHA-1: 7f0afeaf3c4f0f0708875e0de00af6809b3eddd5 SHA-256: f171e21d1601902bfd6af1089731a578d1ad92a5028d583abf9d3a013f96a240
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier, and it contains a large number of external links, many pointing to disposable domains. The PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicate a deliberate attempt to create a link farm. While no scripts were explicitly extracted, the nature of the links suggests a phishing or malware distribution attempt, likely initiated via spearphishing.

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://maypoin.ru/123?utm_term=skip+bo+junior+directions PDF link annotation
    • https://jukatuve.weebly.com/uploads/1/3/2/7/132741058/siwidakevavivuwukam.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414173/normal_5ff0153488eae.pdfIn PDF document text
    • http://profapp.pro/23523333728oen8z.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476757/normal_5fd794a7ac5cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419423/normal_5fd637df5c8b6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476301/normal_5fcbca537c7ef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479932/normal_6006af4d65200.pdfIn PDF document text
    • http://clientesdkb.com/gulimavavuvajidomuwiwcw9zh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426415/normal_60110192e0fab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372377/normal_600e47e4c1216.pdfIn PDF document text
    • http://verifiedbadges-form.com/38913471088pock1.pdfIn PDF document text
    • https://wisamifogafize.weebly.com/uploads/1/3/4/5/134598642/960964.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/zozofufulolig/28821045351.pdfIn PDF document text
    • http://mojabumenir.epizy.com/jixulo.pdfIn PDF document text
    • https://s3.amazonaws.com/nefagolom/47546764897.pdfIn PDF document text
    • https://s3.amazonaws.com/sixolose/cbse_registration_card.pdfIn PDF document text
    • http://pejonoma.epizy.com/animation_movies_maker_software.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 8

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_off0000da66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA66 5208 bytes
SHA-256: 76b9fac363e23525b706628d73a4755ad14131bd9fad26865c00f8660cb3fac4
font_01_sfnt_off0000ec30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC30 11156 bytes
SHA-256: 5f7b86710b173a6c8652d79aaf0c0bf20d1dd28e4652da9e55056a110eeb0d7f

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