Malicious PDF — malware analysis report

Static analysis result for SHA-256 786a868586a4084e…

MALICIOUS

PDF

71.2 KB Created: 2021-05-06 07:48:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 657bfbcdf38e97036bf1165811cbeefa SHA-1: 5fa2857f339710ae2136d4762de68f80056c71b4 SHA-256: 786a868586a4084e17a8927a77e69059263f5163acb2948356bf78af009e76f5
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting and employing UTM parameters, indicative of a link farm designed for SEO manipulation or phishing. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a phishing lure or a downloader for a second-stage payload.

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://jumiwimov.ru/strik?utm_term=spanish+family+tree+template+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4495858/normal_6040db0707f63.pdfIn PDF document text
    • http://mupulopi.22web.org/blindsight_watts.pdfIn PDF document text
    • https://cdn.sqhk.co/bamewimoxatu/ggnYhdW/bejeweled_blitz_free_game.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481424/normal_604b939021690.pdfIn PDF document text
    • https://cdn.sqhk.co/kapopuvida/i7jewje/juvajemibusixu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451566/normal_5fef17f800551.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416787/normal_601db499bd161.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466166/normal_5fdfda9720aae.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3e1ae61b-6b68-46dc-8a90-d1c7a5b9f91c.filesusr.com/ugd/b8bbd7_0a1d908b215d4fcc8c90254792f72fdb.pdf?index=trueIn PDF document text
    • https://0fc0baf9-b884-4fcd-968e-f93c0f938930.filesusr.com/ugd/68ec51_a0a7885b59b04d5fbe01b7047a47d24f.pdf?index=trueIn PDF document text
    • https://86a9da1b-0b57-4b35-a77a-523886b904cd.filesusr.com/ugd/0d9a50_6529e9bd557c488ba03d5d3ec105d5db.pdf?index=trueIn PDF document text
    • http://gelurodo.epizy.com/nonton_film_the_chaser_full_movie_sub_indo.pdfIn PDF document text
    • http://lukegijabezul.rf.gd/tozewasuridifobolaf.pdfIn PDF document text
    • https://443275ec-395d-4f86-84c9-2ed7a250e117.filesusr.com/ugd/7d471d_8400b84b690a431a92a7915f159afce3.pdf?index=trueIn PDF document text
    • https://f39f7cea-6337-46de-af4f-699959e6db0a.filesusr.com/ugd/004672_2a605783a71d41d0b695811c22418157.pdf?index=trueIn 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_off0000d539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD539 5488 bytes
SHA-256: 3a094c8687fe6e3cffee54ee5329b5ea420d871b0e4a08e18eb216d62b308209
font_01_sfnt_off0000e7bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BC 12000 bytes
SHA-256: 5adb167354c8fb689a4c7e0d96a86d0efa4f4829ebea762a242cca783eb2b388

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