Malicious PDF — malware analysis report

Static analysis result for SHA-256 40b2f44ec8d264e7…

MALICIOUS

PDF

76.7 KB Created: 2021-03-20 12:03:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 94fbc7a4ffdc61fde08d3e2fd3daf1fd SHA-1: 20645bb55159f692b3b6eecdaa56da03cf3e81f0 SHA-256: 40b2f44ec8d264e787e0449655f15562a4c6d69e4ae5f2869dc2d6ad0f10bbff
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs pointing to disposable hosting, suggesting it functions as a link farm or phishing lure. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious websites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://midufefew.ru/award?keyword=propiedades+del+apio+pdf PDF link annotation
    • http://chelobaka.space/air_supply_songs_with_lyricss21pq.pdfIn PDF document text
    • http://xxlmature.site/what_are_some_of_your_professional_achievements_awardswt4f1.pdfIn PDF document text
    • http://drilltech.info/a_christmas_carol_guthrie_cast_2019zaslz.pdfIn PDF document text
    • https://cdn.sqhk.co/meradipuwiz/iDhibhh/40695287807.pdfIn PDF document text
    • https://cdn.sqhk.co/bulunazi/hhfhfgg/tiktok_disney_animal_filter_icon.pdfIn PDF document text
    • http://mylevel.store/birapugqwmhs.pdfIn PDF document text
    • https://cdn.sqhk.co/daposofoxig/hhrTGQc/blockapolypsetm_zombie_shooter.pdfIn PDF document text
    • https://cdn.sqhk.co/vedanoderifu/ij3ghcO/36474167224.pdfIn PDF document text
    • https://cdn.sqhk.co/zerurukoraju/YuiaiiH/givirimubiweku.pdfIn PDF document text
    • http://goproits.com/53553871487lli2r.pdfIn PDF document text
    • http://swiss-gear.store/advanced_engineering_mathematics_5th_edition_by_peter_v._oneil206xf.pdfIn PDF document text
    • https://cdn.sqhk.co/jutafegobexe/V6xicNs/nick_robinson_bbc_height.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462714/normal_6005603b8b07c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386606/normal_600bab9789333.pdfIn PDF document text
    • https://cdn.sqhk.co/kezixowog/shfH2gf/80479727849.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420752/normal_5fee3b6a74f30.pdfIn PDF document text
    • http://1-bog.ru/bell_100_bike_computer_manualo7mt9.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/0a2286bc-6e32-4834-b759-369df5c5382a/bryant_plus_90_filter_change.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ac2d42c-b901-403c-b495-323827c41d1e/integral_e-x_cos_2x_dx.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b25e7d6d-6724-4d68-99d3-5b9ae28996f3/kumubiwu.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_off0000ec88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC88 5036 bytes
SHA-256: e8766508f97dac2453174c36ef5311a2cc64f41d5f7bdecf09d43cb7f4aefd96
font_01_sfnt_off0000fdb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB4 11848 bytes
SHA-256: 9641de7a8e0c12476efa88d96c2e55c04cd26ea5181678d5e1c64717f1709dcb

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