Malicious PDF — malware analysis report

Static analysis result for SHA-256 de4045aa10e889a2…

MALICIOUS

PDF

69.5 KB Created: 2021-02-15 10:06:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: a98416e71a0d1d4e01e0f0716a7ecbac SHA-1: 53ed9c05a5a3ddd30a762f4e1826c7fa1fe9b3ab SHA-256: de4045aa10e889a2819f5e6cf4360172ad102b2ff644bb03265ea676cab39c03
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with at least one, 'https://crophysi.ru/123?utm_term=bostitch+n80sb+manual', appearing to be part of a lure. The document body, though heavily obfuscated, contains references to 'Bostitch n80sb manual' and 'wkhtmltopdf', suggesting a social engineering pretext to direct users to malicious sites. No scripts were extracted, but the PDF structure itself is being leveraged for malicious redirection.

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://crophysi.ru/123?utm_term=bostitch+n80sb+manual PDF link annotation
    • http://detonic-italy.website/whisper_of_the_worm_ship_chest79dyl.pdfIn PDF document text
    • http://ihsteam.ru/44629439231v8bn6.pdfIn PDF document text
    • http://ag-management.space/electric_and_water_meter_reading_worksheet8v21l.pdfIn PDF document text
    • http://kovemiwixipogaf.66ghz.com/atualizar_plugins_chrome_android.pdfIn PDF document text
    • http://dijawobal.iblogger.org/kipotovugimoziruduzuroba.pdfIn PDF document text
    • https://danivuzi.weebly.com/uploads/1/3/2/6/132681213/xujugu_mafebuxofilabi.pdfIn PDF document text
    • http://barashik.space/political_instability_in_lesothoarenz.pdfIn PDF document text
    • https://cdn.sqhk.co/razefudixid/sngiZAk/10255975495.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dukuzuwikisos.epizy.com/80916653677.pdfIn PDF document text
    • http://zepotusetazokor.rf.gd/beterobilej.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxexi/wunudopozaredeju.pdfIn PDF document text
    • https://s3.amazonaws.com/lemefofutomapox/dk_eyewitness_travel_guide_new_york.pdfIn PDF document text
    • https://s3.amazonaws.com/dezajok/kubamupiji.pdfIn PDF document text
    • http://nupadamemal.epizy.com/bloody_roar_2_for_android_apk.pdfIn PDF document text
    • http://lazumibuwa.rf.gd/daliwobetowadofuwavevizin.pdfIn PDF document text
    • http://zilokujidetomo.epizy.com/whirlpool_top_loader_washing_machine_manual.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD322 5468 bytes
SHA-256: f901924233201e405b236fd2d44f2d5da09d3ec5422658cb3c14ee3a8830aec7
font_01_sfnt_off0000e595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE595 10456 bytes
SHA-256: d78e2ff7b478342dc4bd926c1b21284979cea1bf12922a360ebd50b94f11a51e

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