Malicious PDF — malware analysis report

Static analysis result for SHA-256 2df36ff3334a72a8…

MALICIOUS

PDF

74.1 KB Created: 2021-02-23 04:57:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 919f56ed4143bf2ffadb33403895c4d3 SHA-1: 3821e8f1faf20007fd7b21b55e1ff6c530559be4 SHA-256: 2df36ff3334a72a82718153036acd119e8bb1eab0b70fa4146a0fd2d1251e168
186 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. 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 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://maypoin.ru/aws?utm_term=bergey%2527s+ford+springhouse+pa PDF link annotation
    • https://cdn.sqhk.co/xidafigutoxa/whejb1t/80334476904.pdfIn PDF document text
    • https://cdn.sqhk.co/tenalewi/goWTKgp/26877703046.pdfIn PDF document text
    • https://cdn.sqhk.co/mepetiruzi/Sp4Dtw4/43458940148.pdfIn PDF document text
    • https://wekupadafar.weebly.com/uploads/1/3/5/3/135315244/b6770df070d6.pdfIn PDF document text
    • https://cdn.sqhk.co/satofapo/cmJjfb1/definition_basic_marketing_principles.pdfIn PDF document text
    • http://airet.space/436335569982suoa.pdfIn PDF document text
    • https://cdn.sqhk.co/tasokuxu/0wjd1jg/38090328455.pdfIn PDF document text
    • http://sandwichhq.club/ashenvale_wow_quest_guidepcbir.pdfIn PDF document text
    • https://cdn.sqhk.co/mibajufaneja/hz1hajq/idle_civilization_world_history_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/dalegoti/0pS1VwY/7141882023.pdfIn PDF document text
    • http://umkatrade.ru/rimertqm3e.pdfIn PDF document text
    • https://cdn.sqhk.co/kunimanujage/iZggojh/can_i_use_move_to_ios_after_setup.pdfIn PDF document text
    • https://winugemu.weebly.com/uploads/1/3/1/0/131070294/f0d6a7c3.pdfIn PDF document text
    • https://bozobazevadetob.weebly.com/uploads/1/3/1/6/131607158/kiduwipodafedepif.pdfIn PDF document text
    • https://nazutusimeraj.weebly.com/uploads/1/3/4/8/134883567/027fe8a5c19b.pdfIn PDF document text
    • https://cdn.sqhk.co/ratosakip/gdihjeS/kiwav.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368975/normal_6018a1b39a8a8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e5b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B0 5456 bytes
SHA-256: a50f4ba373179fc6dd5bc976d96edcff7d54384e59c2eaacde12b548f052567c
font_01_sfnt_off0000f84e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF84E 10268 bytes
SHA-256: 7c40fe2db619a8028c4d4b35ffc7ec0bd259c1ad872b53b2c62e2f8fa27bc4bc

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