Malicious PDF — malware analysis report

Static analysis result for SHA-256 56397ad25a6655b3…

MALICIOUS

PDF

81.8 KB Created: 2021-03-25 14:54:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c59008d56da37979089a55f4809d81be SHA-1: b20edff7161eb3ae842ef6ee1c38e213c394ab8d SHA-256: 56397ad25a6655b39e2ec9c2cbe8e9883ebb1a85dba80c260f33d90cdef3851f
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains a title related to watching mini DV tapes, which is likely a pretext to drive traffic to the malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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://mezovuduw.ru/strik?utm_term=how+to+watch+mini+dv+tapes+on+computer PDF link annotation
    • http://vowuzemiru.medianewsonline.com/69602726392.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497688/normal_60303a17a8a0a.pdfIn PDF document text
    • http://ketoxitigojaluk.sportsontheweb.net/nitrogen_fixation_definition.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386330/normal_5ffa22e49d916.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365540/normal_5ff8fd5d83b1d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368497/normal_600aaef56cbe6.pdfIn PDF document text
    • http://manidat.sportsontheweb.net/wofefiliginimusu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463298/normal_604ca7fb93892.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375696/normal_600c9c4285572.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478655/normal_6002817987581.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402267/normal_602f3cd001a16.pdfIn PDF document text
    • http://dotekebenutedex.scienceontheweb.net/budget_2020_19_pakistan.pdfIn PDF document text
    • http://nesorus.mywebcommunity.org/37195469669.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://abaaaae4-9231-44fc-b12c-ad55ebcc68e7.filesusr.com/ugd/2ca09c_084b0efcf519429f942cb77c362c4a34.pdf?index=trueIn PDF document text
    • https://56db2a4d-09ce-4ff6-a558-abb1d6727cd4.filesusr.com/ugd/003b86_3f5857f13e9945328ee02280f271ec16.pdf?index=trueIn PDF document text
    • https://e5b7f393-9b83-42c5-a877-5b85c0c772c8.filesusr.com/ugd/77b42d_7efdd2b244944b19bf51e3b524d4ce8f.pdf?index=trueIn PDF document text
    • https://305aa2e3-e1d2-413d-aa2e-f1bb83d03ded.filesusr.com/ugd/92ee2b_963a94a0749f44f3ad85cdcbb97a953e.pdf?index=trueIn PDF document text
    • https://36425c1f-c329-48aa-845d-1f8252cb45c8.filesusr.com/ugd/01d500_2d6605b864a4444a836f0c3f2aad5989.pdf?index=trueIn PDF document text
    • https://c46c713f-5e69-4c64-aad4-d86f29440f76.filesusr.com/ugd/957c7b_d10c55b38ba643848de345913639137f.pdf?index=trueIn PDF document text
    • https://e3055f73-6236-423b-b810-4bc1a15f300f.filesusr.com/ugd/fa12d1_117f6caaae8341f4ab1d3bacf78fc2c1.pdf?index=trueIn PDF document text
    • https://8909b315-4d59-4940-aabf-0fdaa532e0ad.filesusr.com/ugd/4542d9_9331ab50b61f46638d8aed7257ddf62b.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_off0000f426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF426 5276 bytes
SHA-256: e5a7c0360a9be639cc47d77b008fda7a6172e85b4261607b3fb16f85e8a305b9
font_01_sfnt_off000105fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105FD 11012 bytes
SHA-256: 565fa48cd46b4797f9ae265cfdf1639495e02534b530f262c8b0e232fe855a49
font_02_sfnt_off00012b64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B64 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378