Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfce9af6108e48ab…

MALICIOUS

PDF

100.9 KB Created: 2021-02-12 03:54:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: a0f0ab55f0eb6197d8569b11b011f7df SHA-1: b2695fac894a3785b19e53657999a2951ba063f7 SHA-256: dfce9af6108e48ab6e47849c4698e2533ac2cc96edf5127ac6530ad95306446e
126 Risk Score

Malware Insights

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

The sample was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous embedded URLs, with one prominent URL pointing to `jottigo.ru`, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains metadata related to `wkhtmltopdf`, which can be used to generate PDFs from web content, further supporting the idea that the PDF is a lure.

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://jottigo.ru/123?utm_term=the+cosmic+serpent+summary PDF link annotation
    • https://nukusuruv.weebly.com/uploads/1/3/1/8/131857442/toserotaju-geguxu.pdfIn PDF document text
    • http://torchland.xyz/sodifexule0v76e.pdfIn PDF document text
    • http://pek-24.cc/rikigotozutupowurixixamalgixe2.pdfIn PDF document text
    • http://prostochillforum.fun/weed_farm_gta_5fsfld.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449965/normal_5ffc0aff3610f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501794/normal_60126c0c75dd7.pdfIn PDF document text
    • https://jamafijuzu.weebly.com/uploads/1/3/1/4/131437216/wejenunat.pdfIn PDF document text
    • https://ramokazadi.weebly.com/uploads/1/3/4/4/134470245/1509481c.pdfIn PDF document text
    • http://eeuuurrrrr.space/exotic_weapon_master_3._5gwjgr.pdfIn PDF document text
    • http://coolvdomaion.online/biker_mice_from_mars_vinnie_bikeotdec.pdfIn PDF document text
    • http://cybety.xyz/491738248u8cfg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403534/normal_5ff57564237f0.pdfIn PDF document text
    • http://galubiwigo.iblogger.org/48175895787.pdfIn PDF document text
    • https://kuzogirig.weebly.com/uploads/1/3/4/7/134748708/savavunixaror.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/rubidokezive/logubuvopamu.pdfIn PDF document text
    • http://zumaruzafomadik.rf.gd/celerio_car_image.pdfIn PDF document text
    • http://gekuvilis.epizy.com/xowabudejit.pdfIn PDF document text
    • https://s3.amazonaws.com/levumoduf/dushman_1998_full_movie_free_mp4.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013fd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FD7 5072 bytes
SHA-256: 27b7dc600c377d2c2f4555eb072e9818bcd18c45e5339fd8ce9459ca532ddcca
font_01_sfnt_off000150ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150EF 11740 bytes
SHA-256: 3580423b7b8fd45ddd814bf88f8db542d2985eafb99d53825c30f9cbb271428c
font_02_sfnt_off000177dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x177DD 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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