Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1519239c3b76093…

MALICIOUS

PDF

78.1 KB Created: 2021-03-26 07:14:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d30949597c91060d11a8829748be2ff3 SHA-1: 9e139f134c8aebb8956110b58abc2cb09e38cdca SHA-256: f1519239c3b76093bd143f85017ecf7ffdb1cbcac2ba20be06defed34719282c
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 external URLs, many hosted on disposable domains, suggesting a link farm or redirection scheme. The document body, though truncated, indicates a lure related to a 'joining report format for govt. employee pdf', aligning with phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://golowaki.ru/123?utm_term=joining+report+format+for+govt.+employee+pdf
    • http://aicberg.net/perfil_de_puesto_de_jefe_de_alimentos_y_bebidas3z2uv.pdf
    • http://vexezujuzas.scienceontheweb.net/reliability_test_in_research.pdf
    • http://pycnidwzxc.info/who_started_cognitive_psychologytie3j.pdf
    • https://natadafupekex.weebly.com/uploads/1/3/1/8/131856288/2aa3bb14ed993.pdf
    • http://grenkasalo4.xyz/avery_8163_template_word_doc7str5.pdf
    • https://xexunejakex.weebly.com/uploads/1/3/4/2/134266262/melelewakap_nofilunuluji_rovovig_gewaner.pdf
    • https://static.s123-cdn-static.com/uploads/4482629/normal_5ffb6dbdde4ee.pdf
    • https://cdn-cms.f-static.net/uploads/4461202/normal_600a29c60e6fe.pdf
    • http://prizinsta24.space/sowerubinuue0wl.pdf
    • http://ronifibofizet.medianewsonline.com/zulu_bible_download.pdf
    • https://danevetiwa.weebly.com/uploads/1/3/4/6/134600357/gapegojetuk-zisodadakudiraz.pdf
    • https://darenufu.weebly.com/uploads/1/3/1/4/131438483/3143202.pdf
    • http://songkfrk.site/renaissance_periodization_vegan_template_review85cox.pdf
    • https://cdn-cms.f-static.net/uploads/4446382/normal_60565f0e724de.pdf
    • http://metazoaapc.fun/libro_administracion_de_recursos_humanos_chiavenatobmwtk.pdf
    • http://zinabexodepo.iblogger.org/zijiji.pdf
    • https://cdn-cms.f-static.net/uploads/4393188/normal_5fdaf56a74f74.pdf
    • https://cdn-cms.f-static.net/uploads/4467017/normal_6020fa7cea1ff.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://ledukuxadom.epizy.com/jerujibagiwivabojawemodi.pdf
    • http://vedukewopaw.rf.gd/faronadevapozisevema.pdf
    • http://leparitupoxow.onlinewebshop.net/68248735445.pdf
    • http://xijizofupe.rf.gd/1mdb_auditor_general_report.pdf
    • http://rosevasejila.myartsonline.com/counter_type_analog_to_digital_converter.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_off0000f2eb.bin
4449fb2b12bf412afb479752b61feea9ef208893f4e2e1776bc8885daa6beee5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EB 5364 bytes
font_01_sfnt_off0001052e.bin
816f9f6bcfde4e332abb062e6cd77c80001b1a87a8d152c6082747b8011a86d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1052E 11060 bytes

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