Malicious PDF — malware analysis report

Static analysis result for SHA-256 e01babc925d2f681…

MALICIOUS

PDF

77.5 KB Created: 2021-03-30 20:47:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: d03978be712c85741f021323b74cffe0 SHA-1: ebd3785b00cb2aea2f98ecba6b9b89c0f1f41297 SHA-256: e01babc925d2f681a84dac6d309136726a2fcd0dea21fd4dbda322ec8061d83a
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The primary URL, 'https://druttle.ru/award?keyword=capacitated+vehicle+routing+problem+pdf', suggests a lure to attract users searching for specific academic or technical documents. ClamAV and ML classifiers also flagged this PDF as malicious, likely due to its suspicious linking behavior and potential for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://druttle.ru/award?keyword=capacitated+vehicle+routing+problem+pdf PDF link annotation
    • https://cdn.sqhk.co/kewawukufiju/iiWhahd/57196511925.pdfIn PDF document text
    • https://lurufabufukigo.weebly.com/uploads/1/3/1/4/131407807/didupu-ravanolujamal.pdfIn PDF document text
    • https://cdn.sqhk.co/palezubifo/geigVhf/29185538726.pdfIn PDF document text
    • https://fofirajajamide.weebly.com/uploads/1/3/4/6/134643930/6932381.pdfIn PDF document text
    • https://ninujesifig.weebly.com/uploads/1/3/1/4/131453022/61c915.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://uploads.strikinglycdn.com/files/977fe108-96c1-4860-8dcf-9e455ec8c93c/kizepadokavipobukubiwu.pdfIn PDF document text
    • https://ed21222e-fee3-4fab-8b52-e2ddb7bb35ab.filesusr.com/ugd/e73fea_85041e3c8ecf429d9495de2a44c0a265.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7a9ba24-fda8-4bcf-8d3c-f2052140bfea/sub_zero_532_ice_maker_manual.pdfIn PDF document text
    • https://c3438639-6a75-4920-aa4f-d1e0b619354f.filesusr.com/ugd/3be3a7_902be4bc7e334eb08ddd8e55ed1d8f62.pdf?index=trueIn PDF document text
    • https://6f847715-c85a-45d9-ae5c-7c68cc800588.filesusr.com/ugd/6e100b_3fbee54d69ca4e0892b7502a8206d50e.pdf?index=trueIn PDF document text
    • https://655b5f2c-2f45-4411-b579-7e5bd587bf3d.filesusr.com/ugd/2a272b_1c001e91d3f04dd999ca0de32613fb0d.pdf?index=trueIn PDF document text
    • http://buxazub.epizy.com/wamazinufavewozubo.pdfIn PDF document text
    • https://f421159b-d329-41e8-bc42-072bc93e4c50.filesusr.com/ugd/65d6f7_91425098302741fcb666eb51af97fb91.pdf?index=trueIn PDF document text
    • https://5e3b32e6-a537-4a58-a531-ef303a468713.filesusr.com/ugd/120874_7743660a3d8f4b649ffab0a7a40e16bd.pdf?index=trueIn PDF document text
    • https://d78d2789-9aef-4bfd-88be-9093bec910ef.filesusr.com/ugd/87a178_eb583993a1184f3896bd6a54378c5e64.pdf?index=trueIn PDF document text
    • http://pozawigemikurup.rf.gd/amortization_tables.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98d7d9d1-f5ae-4e72-8092-f7a659530a93/dbt_handouts_interpersonal_effectiveness.pdfIn PDF document text
    • https://aa6d2f86-95e2-42cc-897e-6bbd71c3a116.filesusr.com/ugd/78daac_5079d51b8d7b45e48ce85623c9a093da.pdf?index=trueIn PDF document text
    • https://ec08fec6-e576-400d-8504-372613838d3c.filesusr.com/ugd/57e0ce_00efee21830a4036ae143ec403281e75.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_off0000e6c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C4 5496 bytes
SHA-256: ba5876025f4552c1cf2b1bd8be9f46db5b541421c330f33582fc8bdc7ea4dcba
font_01_sfnt_off0000f948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF948 9844 bytes
SHA-256: aae343ad4cf48061dbe0d4a5772b192428620e68466e1e0f64646c7fefeb4b7b
font_02_sfnt_off00011ad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD1 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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