Malicious PDF — malware analysis report

Static analysis result for SHA-256 214b03965087aa01…

MALICIOUS

PDF

80.7 KB Created: 2021-04-09 02:07:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: c43191d67b6c425e2a11d5f265b4b960 SHA-1: cccc66e5ed69decfbce406d29b8ea998a6e5dc59 SHA-256: 214b03965087aa016e234071c221f1fab4adec20027757738d961e38c0cecc42
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, indicating a high likelihood of malicious intent. It contains numerous external URIs, with one specifically pointing to a URL designed to appear as a driver download, suggesting a phishing or malware distribution lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this by identifying a link farm on disposable hosting, often used to obscure malicious destinations.

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://midufefew.ru/strik?utm_term=hp+photosmart+5520+driver+download+windows+8.1 PDF link annotation
    • https://cdn.sqhk.co/vufuvevu/Zieig8n/paper_toss_2._0_ios.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379231/normal_60297daeaef93.pdfIn PDF document text
    • http://berasowugixo.mywebcommunity.org/prontuario_del_cemento_armato.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4394066/normal_5ff9dc6533090.pdfIn PDF document text
    • https://cdn.sqhk.co/ragonujip/hjgieMb/fometatuziviwe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476952/normal_5fddb951ec45d.pdfIn PDF document text
    • http://sibamonowoli.22web.org/52189500739.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401555/normal_6067bd899efe2.pdfIn PDF document text
    • http://xivobivivupe.mygamesonline.org/cfa_curriculum_2020_level_3.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/dupula/can_i_watch_under_the_dome_on_netflix.pdfIn PDF document text
    • http://gesesasogibigaw.rf.gd/como_transformar_em_dwg_autocad_2020.pdfIn PDF document text
    • http://bekogufepe.rf.gd/autumn_leaves_piano_notes.pdfIn PDF document text
    • https://s3.amazonaws.com/vuterijoze/horus_heresy_book_collection.pdfIn PDF document text
    • http://kigokigaruv.myartsonline.com/roman_catholic_bible_in_english_free_download.pdfIn PDF document text
    • http://ledukuxadom.epizy.com/57285571102.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a4e6bed-d20a-4a67-ad0c-7004ec403384/dazeredukorodixejaveforok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dec241e2-030e-4b74-a1c5-321f9c2dcf57/what_is_urban_sociology_and_its_scope.pdfIn PDF document text
    • http://xodupope.epizy.com/kisexajikew.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_off0000fa62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA62 5988 bytes
SHA-256: d44244818e07d621202b324a4e31c7933a62eed2efe6feea5dc0e7960922f70c
font_01_sfnt_off00010eb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB1 10720 bytes
SHA-256: a54039cf8771183a0931906460161e48fbb919d0aa45496d0f90008a15c8c96e

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