Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d5bfa777e3e69fe…

MALICIOUS

PDF

76.9 KB Created: 2021-05-02 19:51:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 99e4ac88ff1db470985af2668a848cf7 SHA-1: 4e5b1aa53859b49d47c5e11aa2a44409ae15bbb5 SHA-256: 3d5bfa777e3e69fe31f1c6bd22b07c58bb4fe8076c202d6a78f0eada29d84aea
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains embedded URLs and heuristics indicate it is a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The presence of obfuscated content and external links points to an attempt to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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 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://baarspo.ru/strik?utm_term=microsoft+access+2010+user+guide+pdf PDF link annotation
    • http://olipaka.xyz/tomovimaganirikjuqpg.pdfIn PDF document text
    • http://instapodarok.site/facebook_marketplace_local_pickup_only6ry9f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416661/normal_60445a91ea215.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369501/normal_600306b89fc70.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418166/normal_5fe0483c331ab.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/5680ea10-2943-422b-b4f9-2743bb5b7f39/the_selection_summary_book_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75c25961-d1bc-4188-b291-a9e6581d8f7d/pegasobegimedumukepaza.pdfIn PDF document text
    • http://mukaxasapezaw.rf.gd/tok_presentation_example.pdfIn PDF document text
    • https://s3.amazonaws.com/vetamedisoz/addends_math_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08c68d7a-e6aa-4d65-a02b-5809425d54e1/60150369291.pdfIn PDF document text
    • https://s3.amazonaws.com/dubiditiginowo/bavadofitafipasepogom.pdfIn PDF document text
    • https://s3.amazonaws.com/paxunu/32581342303.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdfeefe7-8f52-426b-b91c-e6df797d29ff/desixuvorijo.pdfIn PDF document text
    • http://wusipoz.rf.gd/melujudufijep.pdfIn PDF document text
    • http://nedupidanasadef.rf.gd/83226240024.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80c5bfe6-574a-47b6-b886-8c14bccf0e1a/bunijonijizuvolug.pdfIn PDF document text
    • http://vebavibokifoko.epizy.com/putusenudelutesanel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b37f4428-1afd-460f-bc5c-62b37407cadb/luzijesatopum.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_off0000ed26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED26 5620 bytes
SHA-256: 720c642b5292b61341ff2cae0b47849e5800b817ce76e7e41de88ea80c67c2e9
font_01_sfnt_off0001006c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1006C 11208 bytes
SHA-256: a4d6d656be1c102e4d92abb54845947df5c5601942d0c96cf171ad9358341928

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