Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddb5b8eadc897678…

MALICIOUS

PDF

69.9 KB Created: 2021-01-09 22:43:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 490698d56151db7179cf6a4297feb5ed SHA-1: e405cfc70ff8541c6df9f711992b47950890681d SHA-256: ddb5b8eadc897678e63ecda24e2fe1a11385bc74d52c7c0c9c274f506237d7ca
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, many of which point to SEO redirectors and link farms, suggesting a phishing or scam attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. The embedded URLs and the heuristic firings related to SEO link farms and redirectors point towards an attempt to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://traffnew.ru/aws?utm_term=best+business+powerpoint+templates+free PDF link annotation
    • https://gupovokezatiku.weebly.com/uploads/1/3/4/8/134878629/228039038.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387224/normal_5fbcb93cca261.pdfIn PDF document text
    • https://buvitefano.weebly.com/uploads/1/3/4/1/134131500/547178.pdfIn PDF document text
    • https://ruwopevod.weebly.com/uploads/1/3/1/3/131397973/6c771aeff7826.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369503/normal_5f8951642e551.pdfIn PDF document text
    • https://wokumedepawal.weebly.com/uploads/1/3/4/6/134607606/voxosot.pdfIn PDF document text
    • https://xusalowaxagus.weebly.com/uploads/1/3/4/4/134481150/8496194.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/doxifuba/linn_county_kansas_recording_fees.pdfIn PDF document text
    • https://s3.amazonaws.com/vavale/cerebral_palsy_in_infancy.pdfIn PDF document text
    • https://s3.amazonaws.com/jojitagifuva/definite_article_exercises_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/gajabedafot/ligazuvilomajonojowafoja.pdfIn PDF document text
    • https://s3.amazonaws.com/purixifusipelid/4486076609.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_off0000d6bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BF 5328 bytes
SHA-256: 310b99b2a807991ef6d3709578bb62340c14b795869ca372ccce67f4fd68a17d
font_01_sfnt_off0000e8d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D2 9900 bytes
SHA-256: 7aa1f8bb8ae2e81c223fe42935625573ef18f0b47d344cac0cd6935d6b9a65fe

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