Malicious PDF — malware analysis report

Static analysis result for SHA-256 26f196488c6f760e…

MALICIOUS

PDF

76.1 KB Created: 2021-03-18 03:20:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: b4a87eb97eb50cac3d2c2227f50a0b07 SHA-1: 72ac44f156861b2b471e14653a251fa3a6c829a9 SHA-256: 26f196488c6f760e77f74472924098adc480e8ad9a456061a14cf694ab39342e
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, indicating a link farm strategy. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and link farm heuristic point towards an attempt to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://dugedepap.ru/strik?utm_term=fit+for+life+physical+therapy+tampa PDF link annotation
    • https://cdn.sqhk.co/rudolikube/ihSijii/fajilobu.pdfIn PDF document text
    • https://cdn.sqhk.co/gabixeme/jPVigmn/red_ball_evolved_level_11.pdfIn PDF document text
    • https://cdn.sqhk.co/satijumok/gjfggfd/45647211759.pdfIn PDF document text
    • https://cdn.sqhk.co/vizebika/ErCfQjf/38550896709.pdfIn PDF document text
    • https://cdn.sqhk.co/vopokemib/y2Ueha1/my_horse_prince.pdfIn PDF document text
    • https://cdn.sqhk.co/xiroxozalal/zgiAzid/70720994013.pdfIn PDF document text
    • https://cdn.sqhk.co/zuxeromewime/IJihlvC/susebipinu.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/7661f414-f929-41e8-9a1f-2186eed1b580/cub_scout_wolf_book_online.pdfIn PDF document text
    • https://54179944-c6a3-49b3-9462-5d1939b6aff2.filesusr.com/ugd/49f5ef_736c7c075b4b44f589d1e4b40aafe157.pdf?index=trueIn PDF document text
    • https://2489a575-72f7-492f-b117-28cfe4a4d2a3.filesusr.com/ugd/d81705_71e8f7c2ad374b3382e002f757f38a59.pdf?index=trueIn PDF document text
    • https://30c74dc1-c3f2-4e71-8253-1ec84f3b94e1.filesusr.com/ugd/b8c6fa_92cc5568660a43498bb00a06054d5a24.pdf?index=trueIn PDF document text
    • https://42190e62-4dca-482d-a077-ae7b222d7779.filesusr.com/ugd/b91392_4541fd23b85249b69d6a1b98a7bc3bb6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/77927b12-e652-44e7-93c2-f55823d726ce/8729330866.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e322e7c-c240-44ad-8201-90b85bf669a5/joe_and_charlie_step_6_worksheet.pdfIn PDF document text
    • https://12dd324c-696b-4d67-8c19-991f3eacec2c.filesusr.com/ugd/eeb7bd_1892983d95104d7191f925f5cc53821b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7c175e3-ce92-45d5-8328-2244566e9983/41308290911.pdfIn PDF document text
    • https://cc6d8859-fc08-4100-a073-55b48c5addfc.filesusr.com/ugd/238140_b59316a7185640809b8cda26f15c65c0.pdf?index=trueIn PDF document text
    • https://bed1e925-73f7-457c-87ff-53f226988024.filesusr.com/ugd/d4a8ce_88bb0b8eece84ed989ff8674af62deb5.pdf?index=trueIn PDF document text
    • https://724418e0-3ace-43c1-abd8-628b4820fc71.filesusr.com/ugd/6df952_5c5ac572da4a4b1cb7f9fa49270b45f0.pdf?index=trueIn PDF document text
    • https://f77c8dad-41d7-4a8f-8d8d-c05149a3a236.filesusr.com/ugd/36d413_4c5c916a332440fdaacab9b55ee6d112.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_off0000dd18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD18 4992 bytes
SHA-256: aa4799f2a7925a7da28b0d44e7be8d4300d0f9ab6f44aba476bf1cc3f5b3eb2d
font_01_sfnt_off0000ee1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1C 10976 bytes
SHA-256: 376a59507b9f7e554b8d769946c96b0470fb694d76ebd25fe4e3197ed5b6f479
font_02_sfnt_off00011391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11391 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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