Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d1631e1d2bb81e6…

MALICIOUS

PDF

69.3 KB Created: 2021-03-11 13:43:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 1076273f8c16d4b7469807aad392f7b0 SHA-1: 64b8587dbb81115438aca3b9e904289c8cfe752f SHA-256: 7d1631e1d2bb81e6080f6d65e3ab130ef9234235187a42a74795a435780ef319
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs that likely lead to phishing sites or malware downloads. The document body itself is heavily obfuscated, but the presence of embedded URLs and the heuristic findings strongly suggest a phishing or SEO manipulation attack pattern. No scripts were extracted, but the structure points towards a malicious document designed to lure users to external sites.

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://kuzutuzo.ru/award?keyword=list+of+common+adjectives+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387571/normal_60369da020b17.pdfIn PDF document text
    • http://shishkin-seed.xyz/mr._bean_animated_movie_freevle6t.pdfIn PDF document text
    • http://openchambre.xyz/coleman_electric_furnace_limit_switchf411v.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404723/normal_6011c3b56ef23.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479445/normal_6018a8d2cc87d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366397/normal_5ff8bb2bb5505.pdfIn PDF document text
    • https://cdn.sqhk.co/febowozefu/XVjg8ib/nopada.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420244/normal_60240eb92c7a4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451754/normal_5fecf7e50855e.pdfIn PDF document text
    • https://cdn.sqhk.co/zebimapajod/jUgfJji/free_gems_hack_coc_no_survey.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474445/normal_5ff3b9c7978d7.pdfIn PDF document text
    • https://cdn.sqhk.co/vadavenaw/jz35hjH/rukukiwigizurisagep.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jiwenufaxo.epizy.com/john_bucchino_grateful_sheet_music_free.pdfIn PDF document text
    • https://937a8a2d-b41a-4163-aff8-eda6db263557.filesusr.com/ugd/21e6f2_eb3c0cbc0d344a2492be0df6b6bf7400.pdf?index=trueIn PDF document text
    • http://wuxizajepasuwu.epizy.com/aadukalam_movie_songs_starmusiq.pdfIn PDF document text
    • https://3745348a-78a0-42d7-8ff4-af2b45bf5faf.filesusr.com/ugd/02631b_21e2783956ab4294ad81128b2e0497a3.pdf?index=trueIn PDF document text
    • http://fofomekurun.rf.gd/how_to_concatenate_sheet_names_in_excel.pdfIn PDF document text
    • http://riduxipilitaj.epizy.com/wave_tom_jobim_piano_sheet_music.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_off0000d654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD654 5248 bytes
SHA-256: 2d6a1384d25824287781b7967334fafc93bcd6648fda816b908e1f3def93593f
font_01_sfnt_off0000e839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE839 9392 bytes
SHA-256: 8cf70e225d8268887e6ff076b3ae14fb61625b5cce393b9de511673109543d4e

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