Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd8df3d8226b184d…

MALICIOUS

PDF

66.4 KB Created: 2020-12-20 22:04:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 4911d2a4a4475c9d31e10b3ea704fef2 SHA-1: c71e2fdeb0f7df9f493f4b5bda14ee6f915ebd2a SHA-256: fd8df3d8226b184d18c7945485716894326e044234723015e63b57a94ca840e8
206 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a callback-phone (TOAD) lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://traffset.ru/123?utm_term=polar+graph+paper+radians PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4385216/normal_5fc1806e85d9e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366381/normal_5f8736fd74ef0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467560/normal_5fc3b473a4792.pdfIn PDF document text
    • https://tipefejiri.weebly.com/uploads/1/3/0/9/130969755/pegupilipegelalelaze.pdfIn PDF document text
    • https://xuzizalebu.weebly.com/uploads/1/3/4/7/134772475/89f114a9436.pdfIn PDF document text
    • https://gilijopagexoda.weebly.com/uploads/1/3/4/7/134713479/1246857.pdfIn PDF document text
    • https://kulinamolusamu.weebly.com/uploads/1/3/4/2/134234583/3635058.pdfIn PDF document text
    • https://dejolezeg.weebly.com/uploads/1/3/2/8/132815968/bupexusarusal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464861/normal_5fc3593861d40.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/1e8a3442-267f-4029-8e43-f3bde9372ba4/lead_anvil_terraria.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce3e6b3c-7dc8-41ad-b569-572b5c9e7ae1/cumplea_os_feliz.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc64a29e2fce462bcb0a474/t/5fc827e390a4f8549d6d2989/1606952932183/usa_today_subscription_phone_number.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f0d3eaf-723d-42a0-a658-208dc6beda1e/stalker_shadow_of_chernobyl_weapon_guide.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_off0000c70a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC70A 5224 bytes
SHA-256: c0ed4d2692d9f20c1d5900a640b9d9c782cab05c4313414a8bcf7b3e6e20accc
font_01_sfnt_off0000d8c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C5 10572 bytes
SHA-256: 1f977399a449ba1ec276f07570678785077ed21200260fbb8418b693e24dfe3f

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