Malicious PDF — malware analysis report

Static analysis result for SHA-256 b093b61b27c45ba1…

MALICIOUS

PDF

74.2 KB Created: 2021-03-07 19:41:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: b70e5a7f1862d7d38bf99d6bf4af63e8 SHA-1: ba999cd0df13d2ebf74ad6c3628895413d883977 SHA-256: b093b61b27c45ba16ea6d19b3df6badceaa8ddccdf21a5cb1d177a531e60e261
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The document body, though truncated, includes a search query related to booking an Apple Store appointment, suggesting a lure.

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://zajinet.ru/wb?keyword=book%20apple%20store%20appointment%20yorkdale PDF link annotation
    • https://cdn.sqhk.co/jotenitix/gchehak/52699172698.pdfIn PDF document text
    • https://cdn.sqhk.co/riroxale/dmySrP5/wisigexegoj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486354/normal_5fce6de3a76a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383922/normal_603cb9f476dbf.pdfIn PDF document text
    • http://benunirudid.iblogger.org/arthur_miller_biography_worksheet.pdfIn PDF document text
    • https://cdn.sqhk.co/kupodakojav/gliehiE/download_for_pc_windows_10_gameloop.pdfIn PDF document text
    • https://cdn.sqhk.co/giruzegovu/NhcsCHk/ravaw.pdfIn PDF document text
    • https://cdn.sqhk.co/kuzezajolu/hHMjaja/zombie_killer_games_unblocked.pdfIn PDF document text
    • https://cdn.sqhk.co/vukixukafoga/IJhdVN6/22083816228.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392462/normal_601b1a94ef3cc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474462/normal_5fe0618a76fa6.pdfIn PDF document text
    • http://verekozugotised.22web.org/d_d_5e_random_character_sheet_generator.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486983/normal_601b425b46d43.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/c7e6994d-e237-45b3-bad5-8a6afb95b4a7/bobcat_s650_service_manual.pdfIn PDF document text
    • https://69868269-04aa-4a0d-8379-1371762fd556.filesusr.com/ugd/d8beff_cf2aabe7fd6642dc91e2f4c7c198c0f0.pdf?index=trueIn PDF document text
    • https://920f4c01-5fd6-4c40-8b27-b99972fecb60.filesusr.com/ugd/d63aaf_0f98cbef7fed4e489a13db4a8195ff24.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a33f1c0-6ea7-4b2e-9cbf-c80686226338/81787032016.pdfIn PDF document text
    • https://67dc9804-4028-4298-afd7-d431d2c16fe6.filesusr.com/ugd/559c84_d98dc821156c4c5cb3abb7f82fc24079.pdf?index=trueIn PDF document text
    • http://borobosen.rf.gd/xipupuma.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_off0000e696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE696 5320 bytes
SHA-256: b8d1d08cfd5b0a27811abd0777951075d54baeb4a4aa4679bd85cd39e44b70d8
font_01_sfnt_off0000f8aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AA 10368 bytes
SHA-256: cca373e0473337510c6a86cbf380de741fba142865dd4bd124d0cbac90008d9e

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