Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c9b7f683e6b5210…

MALICIOUS

PDF

82.2 KB Created: 2021-03-22 18:26:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 480de056f83ce03dc51ee37c9f4e4c1e SHA-1: d8ab48ef34b489a94e67f3997b7b871209345dde SHA-256: 2c9b7f683e6b52105dfa90b5b77037107e40dc8832464110c2f98bf6abfa015d
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, which is likely part of a phishing lure. Although no scripts were extracted, the presence of an external URI and the ML/ClamAV detections strongly suggest a phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/wix?keyword=gopro+hero+user+manual
    • https://static.s123-cdn-static.com/uploads/4494417/normal_5ff5cbc639ba2.pdf
    • http://help-nanny.site/alfie_kohn_theory7kvo2.pdf
    • http://itsamorem.com/serezugeqwpj.pdf
    • http://zoneeuro.pro/91825808499ui84u.pdf
    • http://idealslim-ordina.site/25928643855iwnq.pdf
    • https://static.s123-cdn-static.com/uploads/4484169/normal_60074623f3688.pdf
    • http://idealica-italy.site/tunutosivabazolojowuz1qu1u.pdf
    • http://italdom.fun/vupapakirepinegiragoraverbjm2.pdf
    • https://cdn-cms.f-static.net/uploads/4406806/normal_60290cee44463.pdf
    • https://cdn-cms.f-static.net/uploads/4426549/normal_60431c875062a.pdf
    • https://cdn-cms.f-static.net/uploads/4490918/normal_6054776ca65c3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vukusa/emerald_tablet_of_hermes.pdf
    • https://uploads.strikinglycdn.com/files/d1828497-5093-4bb2-b71b-6574fc571806/bpo_interview_questions_with_answers_for_freshers.pdf
    • https://uploads.strikinglycdn.com/files/3a5c72e2-8edd-4669-b4f0-c9017cd092db/jarimivekezub.pdf
    • https://s3.amazonaws.com/litunux/nemixitapejur.pdf
    • https://uploads.strikinglycdn.com/files/a9881004-4975-4f91-8bd3-c08abf46487c/give_examples_of_simple_and_complex_carbohydrates.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010625.bin
d0085aa88fa35b87bf813d77a5bb83ef87dc23b2526c22d06b838980f49d5de3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10625 5088 bytes
font_01_sfnt_off00011743.bin
db46daf5d26c9ffc257934e1b2e43d23035e009c24b3f2d45500a1d2a9ebf651		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11743 10768 bytes

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