Malicious PDF — malware analysis report

Static analysis result for SHA-256 105644b406a96ddc…

MALICIOUS

PDF

106.9 KB Created: 2021-03-07 12:23:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: ea98061cbd97fde9e5e1c57859d0fb60 SHA-1: d09c19949236cd4a2f78f11a8916aeb1cb3e0cb5 SHA-256: 105644b406a96ddc008b0a8b9be9c6245247b62af479edf6c97728e2d72232c2
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 domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as phishing. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a phishing lure designed to redirect users to malicious 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://pelibifir.ru/wix?keyword=rocket+league+trophy+guide+supersonic+fury PDF link annotation
    • http://voicebftyi.com/wejinetinewowezijeso52i8c.pdfIn PDF document text
    • https://cdn.sqhk.co/sevigexew/ich6hhS/download_no-_root_record_screen_to_video.pdfIn PDF document text
    • https://cdn.sqhk.co/getabemuto/0Dieehg/ninja_air_fryer_oven_sam_s_club.pdfIn PDF document text
    • http://manthoughtswebsite.website/6832678123ynvby.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwopazeg/Jkhdhbv/the_human_resource_management_functions_aim_at_mcq.pdfIn PDF document text
    • https://cdn.sqhk.co/pozazoji/Hn1jeic/blackboard_account_login.pdfIn PDF document text
    • https://cdn.sqhk.co/pulazapusaw/6VhcjlI/ghostrunner_xbox_one_cost.pdfIn PDF document text
    • https://cdn.sqhk.co/xujurovemu/dViihfz/ligub.pdfIn PDF document text
    • http://wordsidepost.top/brighton_v_everton_match_reporteno4e.pdfIn PDF document text
    • https://cdn.sqhk.co/lekibefefu/iduNhjf/ruwitafijaniwu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zalomi/29348305566.pdfIn PDF document text
    • https://f608bf75-187c-4b28-9621-af925c05c2b6.filesusr.com/ugd/05e3ad_c6f4016a10604407ac6819b310badaf9.pdf?index=trueIn PDF document text
    • https://34e2f0dc-0077-42bd-a047-efa2502e92af.filesusr.com/ugd/8a05ec_727ac42d055c404e8b70e9cbee30e6ee.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vunizi/bluetooth_3._0_android.pdfIn PDF document text
    • https://2061f665-9309-41a6-981d-137229ee7e60.filesusr.com/ugd/eb2fe6_e0f9a72460b54a2383480ecc20628a24.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/banula/adam_smith_wealth_of_nations.pdfIn PDF document text
    • https://7fc1e5b2-1dd8-4457-9de2-3dea1ab9f589.filesusr.com/ugd/fedd61_54a4a8f69ff5400fbd463864b9a3b5d8.pdf?index=trueIn PDF document text
    • https://18b62485-dce0-4e35-9712-b1d1f13fcb23.filesusr.com/ugd/296484_8bb06f449bf642ce9ed152e8ce6eecfb.pdf?index=trueIn PDF document text
    • https://63995da9-74be-4895-8497-a4fa53c9845d.filesusr.com/ugd/788c84_f80dfa70d3c044d4a9be377f92b1d232.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000172a7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x172A7 23216 bytes
SHA-256: 735e04d285007e137ecc01d7dcbd9eab9979c599df9ffc35f2e22d653968c3c2
font_00_sfnt_off00013b82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B82 5592 bytes
SHA-256: 7ccb7d7a0ecbab720491f61cce00391a8a0a287980181e5b6300e1cc62197fbf
font_01_sfnt_off00014e94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E94 10460 bytes
SHA-256: 668a990b429ebf27e063f5ada6ae122e1d7f69fa2a44da01599679741b0082da