Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cffda1932aefc17…

MALICIOUS

PDF

79.4 KB Created: 2021-03-20 02:45:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: f36165a3a8e0b89767ea5664603d7986 SHA-1: 236c9f27ffe8ea1b13426438615a0a9dcc00e161 SHA-256: 0cffda1932aefc17554fdd3dd78bf8fbf25bd8932b433f3a4509679e39054013
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm. The heuristic PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM indicate a non-clustered link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO abuse. No scripts were extracted, but the presence of numerous URLs points to a content-delivery or redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://zajinet.ru/award?keyword=actine+control+bula+pdf PDF link annotation
    • https://butapakenora.weebly.com/uploads/1/3/1/8/131871909/5225106.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478968/normal_5ffd53c3d27c1.pdfIn PDF document text
    • https://sowurudiz.weebly.com/uploads/1/3/1/4/131438308/1447441.pdfIn PDF document text
    • http://xanusojuruxu.sportsontheweb.net/36545131065.pdfIn PDF document text
    • https://kazofinuso.weebly.com/uploads/1/3/4/3/134369681/movifiwulokejo.pdfIn PDF document text
    • http://ligumexijigab.getenjoyment.net/amphotericin_b_nephrotoxicity.pdfIn PDF document text
    • https://dojumavuj.weebly.com/uploads/1/3/3/9/133997280/giwexadonogive_roribu_dejolu.pdfIn PDF document text
    • http://jepewadagamer.scienceontheweb.net/al_quran_digital_online_malaysia.pdfIn PDF document text
    • http://beririka.scienceontheweb.net/oracle_sql_certification_cost_in_india.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490542/normal_604327f593f10.pdfIn PDF document text
    • https://nupinegudoxaxu.weebly.com/uploads/1/3/5/3/135350485/lirit-venutozer.pdfIn PDF document text
    • https://banepopewux.weebly.com/uploads/1/3/4/2/134234854/maxekolafiz_mokow_zifivulotok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388596/normal_6010c59dda0d5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0503187d-52cd-4237-9521-a3cb9bf551ae.filesusr.com/ugd/5bb01c_7c5c1bd3793b43f69ae9560d18d64ecd.pdf?index=trueIn PDF document text
    • https://299bc67c-4c9a-44ea-852c-18f2d39dca40.filesusr.com/ugd/954c8b_3898a0117750489f97b97d21a69df72a.pdf?index=trueIn PDF document text
    • http://vubelifijam.atwebpages.com/buku_akuntansi_perusahaan_jasa.pdfIn PDF document text
    • https://s3.amazonaws.com/besafefaf/meduvopetumosetuzu.pdfIn PDF document text
    • https://e3ba7771-1cf2-49b9-be81-d91832e8ed63.filesusr.com/ugd/bc9675_052a21cc4d234d549f88d76b97acc7e3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vabemavuputenif/dota2_ability_draft_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/dazawojob/desert_themed_cat_names.pdfIn PDF document text
    • https://s3.amazonaws.com/jesidofefe/53043736854.pdfIn PDF document text
    • https://f85e9a30-dbb9-40fd-a66d-53bd7daafe07.filesusr.com/ugd/1b9faa_207995519e2e420e9fb2e085f1d45d44.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/falevi/4393895595.pdfIn PDF document text
    • https://e5720c39-3c1c-4a52-9be9-509675281b5a.filesusr.com/ugd/0010c8_5f7ee41b03ac414b8d7e6bffe9367b7f.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD01 5100 bytes
SHA-256: e0b24452d3c2150acfb9b24d6e674c73f6474a055518995fecb9039a5dbaa80b
font_01_sfnt_off0000ee6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6A 13772 bytes
SHA-256: 42277b43f8f8cbcf2647584725f400b9c0a7f3a66cfc119728c6a929e123b06a
font_02_sfnt_off0001194c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1194C 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501

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