Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bf19bb7016881df…

MALICIOUS

PDF

74.6 KB Created: 2021-05-04 02:10:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 79e9105bad78620dfa7c3429785dde4f SHA-1: cfc14a7a6b0bd13e64fd4a407d35a962c15e6e2c SHA-256: 2bf19bb7016881df82b98011b2508724b5629012321bbeaaba030f98dd5000be
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of numerous external URLs points towards a phishing or malicious redirection attack pattern, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://midufefew.ru/strik?utm_term=suunto+cobra+3 PDF link annotation
    • https://lupamotikodoja.weebly.com/uploads/1/3/1/4/131406453/vaxagot.pdfIn PDF document text
    • https://digutejuwunapon.weebly.com/uploads/1/3/5/3/135325267/1586888.pdfIn PDF document text
    • https://bokesavuxi.weebly.com/uploads/1/3/0/9/130968985/roron.pdfIn PDF document text
    • https://cdn.sqhk.co/dixejetafap/WZugh1i/voice_recorder_app_for_windows_7_pc.pdfIn PDF document text
    • https://waxevinibiwe.weebly.com/uploads/1/3/0/9/130969944/kavopezalas.pdfIn PDF document text
    • http://tolagipifumer.iblogger.org/33663239733.pdfIn PDF document text
    • https://bufuxilanu.weebly.com/uploads/1/3/4/4/134402831/tixaj_leruzuto.pdfIn PDF document text
    • https://lotuliwupufak.weebly.com/uploads/1/3/4/8/134873452/nupiwazase.pdfIn PDF document text
    • https://monibobur.weebly.com/uploads/1/3/0/7/130776122/7998258.pdfIn PDF document text
    • https://cdn.sqhk.co/xagegegozi/igsXijf/google_play_services_link.pdfIn PDF document text
    • https://nimudizovif.weebly.com/uploads/1/3/4/4/134478886/wisuvaxubew_bapexiko_xizifaxebosivub_bovidi.pdfIn PDF document text
    • https://lazevipabeba.weebly.com/uploads/1/3/4/7/134712462/cab26c5d2d83979.pdfIn PDF document text
    • https://jadufebifov.weebly.com/uploads/1/3/4/6/134627690/buwupabuwolejif.pdfIn PDF document text
    • https://cdn.sqhk.co/pavujakorige/xXdijib/20388819272.pdfIn PDF document text
    • https://mobunotenu.weebly.com/uploads/1/3/4/4/134403581/putuxipena.pdfIn PDF document text
    • https://cdn.sqhk.co/zekafomaze/SjdiiXB/xorewijisek.pdfIn PDF document text
    • https://cdn.sqhk.co/kupujape/fjeahgd/world_war_2_museum_kansas_city.pdfIn PDF document text
    • http://koxenatez.22web.org/31974057252.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://somupoxalinarek.rf.gd/actus_reus_dan_mens_rea.pdfIn PDF document text
    • http://zuwosopawekaz.rf.gd/ninaguzarebesiwile.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_off0000e54b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE54B 4988 bytes
SHA-256: e4ed3bbe7033886f30833fd061db8be527c7749ac8e869d2c6513cd50c0d037e
font_01_sfnt_off0000f654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF654 11468 bytes
SHA-256: 981ae7d8e2ad83f034cf382d59225a10518c43b4fd0036396f950af835040c34

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