Malicious PDF — malware analysis report

Static analysis result for SHA-256 87ce59730a172b81…

MALICIOUS

PDF

72.7 KB Created: 2021-03-19 21:08:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 17769595ea2a175204c0e3400bafccf0 SHA-1: d6c1ea7d4082113f4b08572274c56fc99486d9cf SHA-256: 87ce59730a172b81e8b2ba5e4b6d145a976330b7f453cb3a1853de62d6e5a527
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL suggesting a lure related to railway recruitment. The presence of external URIs and link farm heuristics indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/123?utm_term=railway+recruitment+2019+online+application+form+mumbai PDF link annotation
    • http://xarijigok.22web.org/anthropocentrism_vs_biocentrism.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393639/normal_604825a81e173.pdfIn PDF document text
    • https://cdn.sqhk.co/gufojakig/ighucqV/63594502900.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416792/normal_5fe120a253bc7.pdfIn PDF document text
    • https://cdn.sqhk.co/verexoleki/QhaUTha/screen_recorder_with_facecam_and_audio_pc.pdfIn PDF document text
    • http://zolekumosex.iblogger.org/carnatic_music_theory_books_in_english.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://badunedotefewep.rf.gd/sensory_evaluation_analogies_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/wowonesoribu/grohe_faucet_leaking_from_top.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/993a3104-a266-4e69-b4f9-83836ed84118/31042326744.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c06562e-8b07-400c-bbef-c4b8433df803/hp_officejet_j6480_repair_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/jolunenafobuw/wameliwefenesen.pdfIn PDF document text
    • http://tezebidurob.epizy.com/fabinoperumexikivabebu.pdfIn PDF document text
    • https://s3.amazonaws.com/zubuwujoxom/malachite_green_formalin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a336253b-cbd2-4d5b-8783-cdfc3981a7a0/how_to_reset_a_keurig_2.0.pdfIn PDF document text
    • http://menenig.rf.gd/powupowusatiwitexemu.pdfIn PDF document text
    • http://lipetefafozil.epizy.com/19456416287.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_off0000df96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF96 5808 bytes
SHA-256: 36308355ca96ef577bc9afd57dabe5cbea562747fe111e7683442598bb8e2ce4
font_01_sfnt_off0000f35f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35F 9968 bytes
SHA-256: 32bd0d6f9204642f8d56b797612ba39777dd1caaa886503e7458abcb86e305f5

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