Malicious PDF — malware analysis report

Static analysis result for SHA-256 8581da29778e1575…

MALICIOUS

PDF

64.7 KB Created: 2020-11-20 13:35:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: a6bd157d6b3ade50f5da0d2828ff248f SHA-1: 9f1df717f3da1ad12cd60ddd9c79605782ee330f SHA-256: 8581da29778e15751567843b83d3b8dfa0025e27599fd19088bd51c744728bae
254 Risk Score

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://gettraff.ru/aws?utm_term=call+log+app+free++for+android In PDF document text
    • https://direvegafazago.weebly.com/uploads/1/3/4/4/134491376/8613161.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451542/normal_5fb0312d75666.pdfIn PDF document text
    • https://fomodaduvi.weebly.com/uploads/1/3/4/7/134700625/padolizirunar.pdfIn PDF document text
    • https://mejebogisoxofix.weebly.com/uploads/1/3/4/6/134606558/54e775c8af.pdfIn PDF document text
    • https://wejibuxod.weebly.com/uploads/1/3/0/7/130740202/2467347.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383800/normal_5f8df6d498332.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458125/normal_5fada99bba08c.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/tosevud/4645045794.pdfIn PDF document text
    • https://s3.amazonaws.com/bevarolimesale/solvay_high_school_chorus.pdfIn PDF document text
    • https://s3.amazonaws.com/vifusupegiza/wovivavupozok.pdfIn PDF document text
    • https://s3.amazonaws.com/gezetega/vaserotipamirasazudolidod.pdfIn PDF document text
    • https://s3.amazonaws.com/sikuva/gasiwarelepusofu.pdfIn PDF document text
    • https://s3.amazonaws.com/zodawanuror/pivifepexidixugup.pdfIn PDF document text
    • https://s3.amazonaws.com/jasadavebaga/95106288274.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_off0000bf56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF56 4936 bytes
SHA-256: 1f36782a05b08efa09e4e892ce1c82e0103c5b5b4bfe53b86ca382f4452cf34a
font_01_sfnt_off0000d02f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD02F 11136 bytes
SHA-256: 4f132cd8e59458753933982b2cf98c444b9d09318f3d5d9b17aafb0b20e76083

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