Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b60938e5f9a517e…

MALICIOUS

PDF

73.7 KB Created: 2021-06-12 19:20:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 071a3a265608e781d83305df4e909e01 SHA-1: 69039e3ad4d0a14fd5e8b9bf85a7e85ab7b9dc98 SHA-256: 8b60938e5f9a517e4fa9680da66199f409d3d69e5700b0a9e49c8c7ef9a625b0
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting it's part of a link farm designed to drive traffic. The document body, though heavily obfuscated, appears to contain a search query, further supporting the link farm hypothesis. No scripts were extracted, but the PDF structure and numerous external links are indicative of a phishing or traffic-generation scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://cructi.ru/pbw?utm_term=how+often+do+girl+dogs+go+into+heat PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417145/normal_603cc6f17f019.pdfIn PDF document text
    • https://kivisazof.weebly.com/uploads/1/3/2/6/132696558/takukusafu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481164/normal_606d2dbbb7fc5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489411/normal_6014bd04d17f3.pdfIn PDF document text
    • https://ditowesoxuro.weebly.com/uploads/1/3/4/8/134885058/6587942.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4403557/normal_60afff4c16385.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488322/normal_603d15dfd2f20.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a47429d1-c4f3-4794-a3ca-ae953719da45/4774311184.pdfIn PDF document text
    • http://wikoborumun.pbworks.com/f/15164322992.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/630a61cb-7aee-4f3b-a9c7-7208739135b2/new_holland_451_sickle_mower_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4de6ba37-556d-44fd-a95b-22516a5df5a3/the_practice_of_rational_emotive_behavior_therapy_free_download.pdfIn PDF document text
    • http://zobafolu.pbworks.com/w/file/fetch/144954825/nepowadigatesojexasufij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8de1f52-62c9-4ba4-83e4-cd8dba1b15bf/wiruvebogupetatarisi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4378e35d-4ee9-4273-8cd3-c02de4e9c2cd/flowers_for_algernon_movie_comparison_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5babfc48-4b23-44c1-b99b-d41c2e99a4c3/43920949374.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6ee311f-1151-417f-971a-65110676f75c/bafene.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea4f22ab-0dd0-4263-b675-d9d42b3a0ffe/37849807577.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e207b4a4-007b-4a05-afe7-ed680347b3ba/5834176073.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e5e5427-10b1-4642-8adf-c18f4f75812b/88193075973.pdfIn PDF document text
    • http://nunaruribeg.pbworks.com/f/trigonometry_practice_coloring_activity_answer_key.pdfIn PDF document text
    • http://noxiwako.pbworks.com/w/file/fetch/144524070/gad_elmaleh_sans_tambour_streaming_vf_hd.pdfIn PDF document text
    • http://bikitowovur.pbworks.com/f/dish_hopper_starting_up_9999.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ded73a4-67be-4e90-8843-eb7c421cb71c/boxaxedemekus.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_off0000e19d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19D 5220 bytes
SHA-256: 51d53907b02bf48387f3765b4a7f996d6f622e466fed572af85979caff6e1b24
font_01_sfnt_off0000f36d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36D 10660 bytes
SHA-256: 79e650b39e2d0dfd5c1de471be1404d39409998de700b6adee94c917bb6d0c77