Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c3cfdef168462a5…

MALICIOUS

PDF

106.1 KB Created: 2021-03-17 10:54:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f6f7bde4f081a7869f59e1d4ca0e21e2 SHA-1: b24ee8453b5de746dcb47197fa928a67c7bf1317 SHA-256: 6c3cfdef168462a5f1bd9fefae194bc6ab66871de3fac7ab15b372a8b1efcc9d
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to drive traffic to potentially malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://jumiwimov.ru/123?utm_term=non+carious+lesions+and+their+management+pdf
    • https://nokifafib.weebly.com/uploads/1/3/4/5/134597692/xuwebilubolazej_matemaj.pdf
    • http://bodyita.space/badminton_racket_grip_size_guide94gjb.pdf
    • http://smm-target.ru/ducane_ac10b36_b_manual58lw8.pdf
    • https://rutarutan.weebly.com/uploads/1/3/5/2/135294158/zejowumor_gazizosanakuv_gixujixamojo_nasanuzavaje.pdf
    • http://jofipifemu.medianewsonline.com/50933880010.pdf
    • https://wozujetibudod.weebly.com/uploads/1/3/2/6/132682293/7422750.pdf
    • https://cdn.sqhk.co/pawanipol/gvmiiOq/xolunukefudukosusaxije.pdf
    • http://kenugizi.getenjoyment.net/full_list_of_italian_irregular_verbs.pdf
    • http://nadipewin.mywebcommunity.org/accounting_auditing_and_accountability_journal.pdf
    • https://danonifakusore.weebly.com/uploads/1/3/1/4/131483465/a4d36a264f2.pdf
    • https://cdn.sqhk.co/nedabuke/SXiajj2/fake_gps_go_location_spoofer_free_ios.pdf
    • https://cdn.sqhk.co/rogudokives/jfjajel/godiseralebopunatabowulu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nefunupu/environment_agency_flood_risk_management_estimating_guide.pdf
    • https://2a07c75e-e898-48ba-b326-4cccc82d0599.filesusr.com/ugd/ff154e_17b384e99b5d4ad9b5c1155eb40c144a.pdf?index=true
    • http://mizetum.onlinewebshop.net/are_folding_stocks_legal_on_pistols.pdf
    • http://sipanokule.onlinewebshop.net/bonaxajap.pdf
    • https://s3.amazonaws.com/pujinit/axolotl_care_sheet.pdf
    • https://s3.amazonaws.com/sugosubexez/rowdy_baby_song_telugu_maari_2.pdf
    • https://920f4c01-5fd6-4c40-8b27-b99972fecb60.filesusr.com/ugd/d63aaf_f25ed50f4eee4e04b6ac1cbcf9125556.pdf?index=true
    • 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_off00016197.bin
6511460e313302673eb9082cf42c6c3bb4ae2cf05d12abd3a8659427b40e44ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16197 5536 bytes
font_01_sfnt_off00017447.bin
fbc091ee18ed7634045b3fffca920da77137c17d04489079742516a7be0c9ec8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17447 11476 bytes

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