Malicious PDF — malware analysis report

Static analysis result for SHA-256 f31f3cdf6a0f9b2a…

MALICIOUS

PDF

75.4 KB Created: 2021-04-04 08:31:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 1a53d0cee69188d9129f3514bf6704ce SHA-1: 908957f75eb91c9ac0e66bae83b88e9c2b232b0c SHA-256: f31f3cdf6a0f9b2ad4058e8ed48ed2d20bd76723a5999caecd098917af4761ed
126 Risk Score

Malware Insights

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

The PDF file contains multiple heuristics indicating it is a link farm and potentially malicious, with ML and ClamAV flagging it as a phishing trojan. The document body, though partially corrupted, suggests a lure related to 'Belgium league table form and fixture'. The primary IOC is a URL that appears to be part of this lure, likely leading to a malicious site.

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://fokemale.ru/123?utm_term=belgium+league+table+form+and+fixture PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4384819/normal_5fed0c5b26988.pdfIn PDF document text
    • https://cdn.sqhk.co/jizuxadif/3Qv1921/vuzolaxofometo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476146/normal_601ad7d98693f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461523/normal_601bd05664deb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369659/normal_601dc85c5ac71.pdfIn PDF document text
    • http://jixelaxoli.66ghz.com/guide_blade_carrier_steam_turbine.pdfIn PDF document text
    • https://cdn.sqhk.co/mofijovelu/gdJlgim/movies_free_full_hd-_watch_free_2019_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rebipilu.epizy.com/mudra_bank_loan_form.pdfIn PDF document text
    • http://jusisow.rf.gd/14346261375.pdfIn PDF document text
    • http://zisafaziga.epizy.com/does_costco_report_to_dun_and_bradstreet.pdfIn PDF document text
    • https://s3.amazonaws.com/fotojipifuzitul/neuralgia_del_trigemino_elsevier.pdfIn PDF document text
    • http://runonadopufeta.epizy.com/waxiwoxur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18968ff7-4aad-41e0-8a1b-3c7558d0cf08/how_to_set_up_la_crosse_atomic_clock.pdfIn PDF document text
    • https://s3.amazonaws.com/lemefofutomapox/99587082719.pdfIn PDF document text
    • http://widenipana.epizy.com/beethoven_piano_sonata_31.pdfIn PDF document text
    • http://kejajuzajibig.rf.gd/breach_of_contract_notice.pdfIn PDF document text
    • http://pilulozames.epizy.com/subject_verb_agreement_worksheets_grade_8.pdfIn PDF document text
    • http://mepoketefetur.rf.gd/modern_business_administration_sixth_edition.pdfIn PDF document text
    • http://bulagim.epizy.com/the_elephant_vanishes_themes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8c1fbe2-1f86-41b1-9842-2aef54eadba7/gypsy_bard_guitar_chords.pdfIn PDF document text
    • https://s3.amazonaws.com/podawakumepewez/iim_indore_admission_form_2020.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_off0000e91b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE91B 5304 bytes
SHA-256: 273da7b23b96b3ef19c7a71dbbf5880c40c8f097dc18a52d5344468963865287
font_01_sfnt_off0000fb17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB17 10936 bytes
SHA-256: e933706a606b3061b7c5981e99705681067a9109d401393a21590e292cfcfffc

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