Malicious PDF — malware analysis report

Static analysis result for SHA-256 e26db7aeaf0c5c62…

MALICIOUS

PDF

74.6 KB Created: 2021-04-30 09:23:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 1664d44d458d193934c5d542684cdae2 SHA-1: 1019d31bb0e40ffd270b707af7c17b19116bcef6 SHA-256: e26db7aeaf0c5c62a8748747a09ef82711fea55bd8d4c26eae21df0c77d7c85b
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://jacksth.ru/strik?utm_term=amazon+fire+10+user+manual PDF link annotation
    • https://cdn.sqhk.co/vovewotutal/tv6gemf/9676070119.pdfIn PDF document text
    • https://cdn.sqhk.co/xaveredero/jhhggdX/best_first_person_shooting_games_for_switch.pdfIn PDF document text
    • http://prodson.fun/jokutibojusebutewud0s.pdfIn PDF document text
    • http://sis-paypal.com/608814298134ov1g.pdfIn PDF document text
    • https://cdn.sqhk.co/ramejolir/9uPaEgf/babarizi.pdfIn PDF document text
    • https://cdn.sqhk.co/mekurapiw/SFhbjaI/warhound_titan_stl.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/b3e3ad0c-af40-4334-bec1-183356684544/what_does_pimps_and_hoes_mean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df100d8c-cca9-4a69-a80e-3f9097586ec8/al_quran_mp3_30_juz.pdfIn PDF document text
    • https://359ea524-acbf-40a7-8d58-ee96a8f10bc8.filesusr.com/ugd/ca2e76_98d9f2fdbf244aec8325c7f1e16b98de.pdf?index=trueIn PDF document text
    • https://684917c6-b594-4497-9ea4-141105166a5b.filesusr.com/ugd/0dc9f5_8beb484c479c4e68a3f0389756dbd06d.pdf?index=trueIn PDF document text
    • http://pubikuvudara.epizy.com/nuzuluf.pdfIn PDF document text
    • https://0fc0baf9-b884-4fcd-968e-f93c0f938930.filesusr.com/ugd/68ec51_d0ee0d656cd043ce967272384e8ba764.pdf?index=trueIn PDF document text
    • http://mipaduverututus.rf.gd/77082640274.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55c6f14f-c7db-4808-95d1-aaff18fd78e4/fuwonudebodezaxa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01c62d4b-9dee-4095-9ead-873543cc928e/timex_mens_expedition_field_chronograph_watch_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eea0f130-812a-4bea-8c2a-78966be0f108/96328778052.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_off0000e63c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE63C 5144 bytes
SHA-256: 537f87169a596f9769922af3e71079f174337e320a54ae9ff9c08d80c12bccb5
font_01_sfnt_off0000f7ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AC 11036 bytes
SHA-256: cf56be25a2ce67afa4b29e2c4c9df0f44d7cbf61c7497f7a186013875e1a9151

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