Malicious PDF — malware analysis report

Static analysis result for SHA-256 8490d2d9b407c28b…

MALICIOUS

PDF

72.7 KB Created: 2021-03-23 03:02:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 2333dc55aeca9b1310f6596d3eae725b SHA-1: 580c101ca11250222b53baed17da99ba900dcb77 SHA-256: 8490d2d9b407c28b1bb8537c6ca23fd388cc9e051f9403d0b8eece6fc3710408
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 pointing to disposable domains, suggesting a link farm or SEO spam operation. The primary URL, 'https://bologen.ru/award?keyword=bhagavad+gita+telugu+pdf+ttd', is presented as a search result, indicating a deceptive lure. ClamAV and ML classifiers also flagged this PDF as malicious, likely due to its link farm characteristics and potential for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://bologen.ru/award?keyword=bhagavad+gita+telugu+pdf+ttd PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4447888/normal_5fe156872295d.pdfIn PDF document text
    • https://tezefuvin.weebly.com/uploads/1/3/4/4/134496048/dd81b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380857/normal_5fc72a79b05d8.pdfIn PDF document text
    • https://jenodaxadow.weebly.com/uploads/1/3/4/0/134012655/lelukigukaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420222/normal_60304e8340df1.pdfIn PDF document text
    • https://bebilakag.weebly.com/uploads/1/3/0/7/130776425/507762272d0ac56.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459035/normal_600eaee50d287.pdfIn PDF document text
    • https://zipebamaxotunev.weebly.com/uploads/1/3/2/8/132814247/c990e269a80.pdfIn PDF document text
    • https://talipugetajizan.weebly.com/uploads/1/3/4/8/134862074/kemotepuwo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482206/normal_604f2798832f0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/towakog/body_of_lies_full_movie_480p.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2aa8bfe8-7726-460a-bea2-0168a831f899/how_to_show_value_instead_of_formula_in_excel_2010.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65326031-7fe0-4315-8cf2-6068097de531/love_story_lyrics_video_song_download.pdfIn PDF document text
    • https://ec5f18f3-5b2e-4778-830d-9472146220da.filesusr.com/ugd/6c313a_4afa5340840346a292d3737b0cbcc274.pdf?index=trueIn PDF document text
    • https://8d2868a3-57b7-484c-81f6-493c1c4f5daa.filesusr.com/ugd/a8ca0f_1546f8ce92b343e09b53c8da2a88f002.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d16aae7a-678a-44f3-8b2b-8ab095f8d87b/clases_de_comunicacion_para_primer_grado_de_primaria.pdfIn PDF document text
    • https://cdfb6f36-dde2-4af5-b3b7-55ff39976061.filesusr.com/ugd/c6ac46_071992dc00b546368adcd68e169517af.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fezenur/dukulubatenax.pdfIn PDF document text
    • https://b2d1eea7-aef5-47fc-962c-88b5513ecafc.filesusr.com/ugd/3a57bc_edd214a6ca4944a1ac0f7153affde206.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/32f52895-ed50-4144-90ff-3d359c6899bd/what_are_the_6_principles_of_gestalt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d9504f4-a3f7-46b3-a115-e9bfb22c102d/how_to_set_aside_judgment_in_default_malaysia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16e9e772-a5b1-4e7a-bb30-cfc46b241f55/netgear_3700_setup.pdfIn PDF document text
    • https://05491ccc-77c7-428b-9c25-74f2c6c50d4a.filesusr.com/ugd/d51d36_990b5a3e54a64ba394c3039233aef21c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9531274b-b7fc-4e04-9674-4d6df7ece3c2/how_do_you_communicate_effectively_at_work.pdfIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0D 5140 bytes
SHA-256: b27ad764f147b15489e4acada9bacfb5f06624ff37db50e54c1b77a6d4eaf5d0
font_01_sfnt_off0000f09e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09E 10204 bytes
SHA-256: bba616a2854c267c114c69c84c4ce9e274b1a9e515c2e85fee64674b173302d6