Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed35b8f9a8dcfc17…

MALICIOUS

PDF

99.2 KB Created: 2021-03-27 21:23:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 4c549af4bebafb0c1964479defbcd8de SHA-1: 9e7d8db5110ef302a4965f5e3fa704add9be4e13 SHA-256: ed35b8f9a8dcfc17fd30bd7faf038db8d887fc58905f2727dd4ecbaeb5447235
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains multiple embedded URLs, with one pointing to 'lozipotod.ru', which is flagged as a link farm on disposable hosting. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs. The presence of external URIs and the link farm heuristic strongly suggest the document's purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lozipotod.ru/strik?utm_term=how+do+you+say+super+ugly+in+french PDF link annotation
    • http://nuverlites.online/8074008780983p9f.pdfIn PDF document text
    • http://ourfanz.com/easy_english_exercises_for_beginnershunpa.pdfIn PDF document text
    • http://erse.xyz/thule_cycle_carrier_instructionsqcknv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481163/normal_6018bf9d170ce.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405420/normal_5fe1157cabecf.pdfIn PDF document text
    • http://urolog.xyz/pemozabijiwezegifirat5b4s.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475729/normal_5ff4b32fc2ba6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454420/normal_60380cab472e3.pdfIn PDF document text
    • http://calipshatngaccs1.xyz/81110817283ck2xu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366665/normal_604e758f6c3d4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393186/normal_60026213d751e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/07c90d04-7725-488e-b720-0a55d77608b6/goat_simulator_payday_2_player.pdfIn PDF document text
    • https://s3.amazonaws.com/gonasidupij/10934117049.pdfIn PDF document text
    • https://99f4a897-b223-4833-863a-50ad465ba5d5.filesusr.com/ugd/8e2371_b5d316deefb9473ba746ea09302cf06b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/marimejerebo/free_template_powerpoint_2019.pdfIn PDF document text
    • https://d0aee4dd-c5bf-4c29-adcf-3aa844f59ef3.filesusr.com/ugd/193d13_30e37fba346641349854875252dde4d2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sepovutapakogaf/alvida_song_video_mp4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/addb3f34-2f5d-4fac-be73-fd84021ab87e/ruvesizuxekobuvirolikirad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cf07a66-c7ba-4580-a0dc-24508a0d352d/gopedubaw.pdfIn PDF document text
    • https://aabf49e0-5477-4fd2-8456-a986ef8f2a87.filesusr.com/ugd/9e14ca_6a561576343c4d9b826f0a6294ecf175.pdf?index=trueIn PDF document text
    • https://95a83a18-022f-4aa5-9dc2-588eac4c5c4a.filesusr.com/ugd/ccb6ab_ac1e3660cf2f4708addfe22ed369b790.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lupuvogotog/fufubapovusonejave.pdfIn PDF document text
    • https://s3.amazonaws.com/wekibik/abrasive_jet_machining_process.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9a8a499-c152-43a1-b6d3-dddef88d144e/how_does_a_dual_hose_portable_ac_work.pdfIn PDF document text
    • https://62619d47-812b-4c4f-a232-aa08d86264e8.filesusr.com/ugd/6d62c1_500efe34692d4d3b9547f8325aa4b9a7.pdf?index=trueIn 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_off0000f854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF854 24784 bytes
SHA-256: dfa2704fb9690e7d1c8f362370e714e710b20de81f7a2c73b488bedc3df1b634
font_01_sfnt_off00014574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14574 5572 bytes
SHA-256: 8417d54583493a201623b24df9a7bd0b3d60c439a24e6f92ea893b877ed14795
font_02_sfnt_off00015879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15879 10768 bytes
SHA-256: 278522f73fe09ac9d202c6d701044148d870ce282c85bd12a02c00ef556f66e8

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