Malicious PDF — malware analysis report

Static analysis result for SHA-256 31ba9c8b647ab585…

MALICIOUS

PDF

77.1 KB Created: 2021-04-03 20:23:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d9821be0553f4679a834a533135e4306 SHA-1: 7b2455339842a435e0556525f66f36d1e339b421 SHA-256: 31ba9c8b647ab58512776428d7652ffc76181d96d0a964622fae693611b9dc12
186 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting services, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically related to phishing. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://maypoin.ru/wix?keyword=lightroom+apk+5.2
    • http://instacopyrighthelpteam.com/gimezagezuwijfq0e.pdf
    • https://cdn.sqhk.co/molavagew/VlhegdC/fast_racing_league_dolphin.pdf
    • http://lakshmi-store.ru/godaddy._com_website_templatesi41nt.pdf
    • https://cdn-cms.f-static.net/uploads/4390680/normal_6037d9a02f82a.pdf
    • http://twenty-promo2020.ru/nutrition_care_process_and_model_part_1_the_2008_updateqzw9g.pdf
    • https://cdn-cms.f-static.net/uploads/4463279/normal_602510c020192.pdf
    • http://reduslimitaly.website/best_recording_mixing_and_mastering_software8wksd.pdf
    • http://hookup154.site/42911454127drivm.pdf
    • https://cdn-cms.f-static.net/uploads/4409123/normal_600d7b030b875.pdf
    • https://cdn.sqhk.co/wobuwozavenu/htikmvH/moto_bike_attack_race_3d_games.pdf
    • https://cdn-cms.f-static.net/uploads/4470703/normal_6055df58e8850.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://6c403777-3bdb-430d-a4ca-23d5788374d5.filesusr.com/ugd/e0034b_300ce1d0768941769566b91d7def2a79.pdf?index=true
    • https://b8436764-02b3-4471-8711-1e8fed235cf0.filesusr.com/ugd/3b3fbb_7b32716e61ca45699cd3b19973cfc38f.pdf?index=true
    • https://3c86e5df-9a55-47dd-9d5b-c207b25ec6cd.filesusr.com/ugd/72bf36_cea2b79a3bd34ca19fa699f06cd90445.pdf?index=true
    • https://uploads.strikinglycdn.com/files/25aaefcd-44eb-4bc4-8fc0-1e95d5b237a5/sodastream_source_element_instructions.pdf
    • https://849bdae7-2456-4570-9e2a-fc769e7e49ad.filesusr.com/ugd/2074c9_f047e7cc95574e7bb22277f2e58ac283.pdf?index=true
    • https://b01cffea-7a05-49e8-9781-04202a21c04b.filesusr.com/ugd/d5d855_3bcde213809f49be94d166b9fd4ef8f9.pdf?index=true
    • https://11484d69-1612-41b9-9199-165df1f08223.filesusr.com/ugd/e2f197_7257a616155f4dcaa3daead6cfd07bc5.pdf?index=true
    • https://c63ca81c-6df4-4ec3-bc2e-8508f29a6879.filesusr.com/ugd/d48fe3_269c09fd2aeb4a47b64acd7f4362a705.pdf?index=true
    • https://uploads.strikinglycdn.com/files/230ddf83-9713-46ea-9163-17e4d3a94634/tabla_de_aniones_y_cationes_mas_usados.pdf
    • https://ebd73b9a-b255-48a5-b781-2bd84b483b4c.filesusr.com/ugd/956c05_4e519c281e87447b82d3b93ea2935dbc.pdf?index=true
    • https://uploads.strikinglycdn.com/files/768f628b-a792-4310-9724-a30180e4d267/sowekamowajujeso.pdf
    • https://5f90d536-2a72-4461-adff-280afd3056cb.filesusr.com/ugd/27c394_28480a0d29c34cc98d45a9f5818027ec.pdf?index=true
    • https://6c8ebe11-725c-420b-823a-68bc39d02ad2.filesusr.com/ugd/3e87bf_76596cc7a0ab43b79bb52dd4303475c7.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_off0000eefc.bin
cb82398b0b60f7e1f984b4ee12d2c26860699ddc72de6e60b8794fe94c073783
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFC 5316 bytes
font_01_sfnt_off000100f6.bin
b4390fd15283cc519fd36aa9aaea7fa11608c3a12e364ecc07c2e0e12ef28fed
pdf-font-stream PDF embedded font (sfnt) at offset 0x100F6 11340 bytes