Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7afc4f63728e270…

MALICIOUS

PDF

82.2 KB Created: 2020-12-27 08:31:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: a58c09a31854497eeb4aba482480bf56 SHA-1: a27bf83a3361b079f50c36806d5fa48b7345732f SHA-256: a7afc4f63728e270c0a28e91bab68eda0f7965cd213abe73c304ca36d6a3af57
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to distribute further malicious content or phish users. The presence of embedded URLs and the overall structure strongly suggest a phishing or malware distribution campaign.

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://trafffe.ru/aws?utm_term=aquilla+lake+ohio+fishing+report PDF link annotation
    • https://dalegoronatodul.weebly.com/uploads/1/3/4/3/134309481/be37954d91b.pdfIn PDF document text
    • https://papunagaku.weebly.com/uploads/1/3/1/3/131384156/milutubonelalovugixa.pdfIn PDF document text
    • https://vagewojevibo.weebly.com/uploads/1/3/4/8/134873572/kajifa.pdfIn PDF document text
    • https://cdn.sqhk.co/pepitaji/czpRVia/30817584585.pdfIn PDF document text
    • https://viwekaxirudadax.weebly.com/uploads/1/3/4/7/134700275/5227875.pdfIn PDF document text
    • https://welajewovire.weebly.com/uploads/1/3/3/9/133999455/98d22b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391024/normal_5fb27d543ee99.pdfIn PDF document text
    • https://cdn.sqhk.co/folamudoj/gCLjehe/mupafipovuvuketepoxub.pdfIn PDF document text
    • https://cdn.sqhk.co/nupegefozub/c8jc7qp/supigijazimumipunitev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378836/normal_5f9c7e096638d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a68733b-66af-48a5-b4dd-95b87ecd08a4/22791410756.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/adad7c4c-dc05-44c5-a111-02323c0e0701/gidoziver.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32468c01-6ed6-490d-9e54-0ee8964010d5/zapivepuxej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/635c2815-bf49-469f-bb44-24769f0374f1/guitar_tuner_app_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9d38b02-7481-4713-ba27-f9e4177f332e/advanced_players_guide_pathfinder.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf4376d8-5b7f-4a00-88a4-95ddcdc344c5/japuluvebazejijuw.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_off000105fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105FC 5344 bytes
SHA-256: 40fb057a6d562e67b7e7d0768a45fd6f2d87d3e268a700ddc2557f91cd50144d
font_01_sfnt_off0001182a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1182A 10320 bytes
SHA-256: 0c98f92a7fcc4e5567c5a611a239065f2093685f9c844c8206950b92b154e0a0

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