Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9fe80cef3239f29…

MALICIOUS

PDF

66.8 KB Created: 2021-01-31 09:09:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 6e7979d45de1f14e256cf5a2a506d069 SHA-1: 059addad06f47d4ae09aabacfce1f4b542ddb5e5 SHA-256: a9fe80cef3239f292e85ef722c70f569fa4dec4cd3c7d65ac193ea0610d10e61
96 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ML classifiers and ClamAV, with a high risk score. It contains an embedded URI pointing to 'jacksth.ru', which is likely part of a phishing or scam campaign. The document body, though heavily obfuscated, suggests a lure related to an 'express entry guide'. No scripts were extracted, but the presence of external URLs and the nature of the detection suggest it's designed to redirect users to malicious content.

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/aws?utm_term=bc+pnp+express+entry+guide PDF link annotation
    • https://cdn.sqhk.co/xesozugis/bJ8hhij/23266739484.pdfIn PDF document text
    • https://babipuwoze.weebly.com/uploads/1/3/4/8/134865032/xopevax.pdfIn PDF document text
    • https://cdn.sqhk.co/fazejitev/1hjnDij/streamlabs_prime_crack_apk.pdfIn PDF document text
    • http://tiktokcopyrighthelpteam.com/nazowonemebasaboj56irw.pdfIn PDF document text
    • https://cdn.sqhk.co/bitaxukezor/PNjdihc/ez_loader_trailer_tongue_weight.pdfIn PDF document text
    • http://hookup154.fun/police_chase_las_vegas_nevadaz83zv.pdfIn PDF document text
    • https://vozutadisifik.weebly.com/uploads/1/3/1/4/131483249/c70a19.pdfIn PDF document text
    • https://cdn.sqhk.co/vifamepupib/Chajejb/joker_heath_ledger_wallpaper_android.pdfIn PDF document text
    • https://cdn.sqhk.co/fukonovum/Nhg0k5U/school_teacher_application.pdfIn PDF document text
    • https://cdn.sqhk.co/pikuworano/ijjcrhg/crash_bandicoot_on_the_run_app_store.pdfIn PDF document text
    • http://persequenteamsohbet.com/physique_chimie_1re_s_hachette_2015qpq4i.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/kakef/template_letter_from_santa_to_child.pdfIn PDF document text
    • https://s3.amazonaws.com/gulapore/6168043197.pdfIn PDF document text
    • https://s3.amazonaws.com/fajujiju/60176998784.pdfIn PDF document text
    • https://s3.amazonaws.com/votubukaxogilix/zomaroxito.pdfIn PDF document text
    • https://s3.amazonaws.com/dozore/mutupuzasixuzodogupedoxiz.pdfIn PDF document text
    • https://s3.amazonaws.com/sogovekevi/3457631579.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_off0000c981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC981 5220 bytes
SHA-256: 212dba780fadadd0cffd87b9118695dcb4955450febd1d35b4b9e8f6a76404fb
font_01_sfnt_off0000db66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB66 10224 bytes
SHA-256: e2901b1730811950a311b5506a5db4004cdf1a68e6cb9ed9ec16ee496159377a

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