Malicious PDF — malware analysis report

Static analysis result for SHA-256 d91ac7419d838b08…

MALICIOUS

PDF

100.7 KB Created: 2021-04-08 08:11:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: aaff9e48457844edc7c4e91297585288 SHA-1: 786ed28c548c8fe2df4909224086bb18bf04cfd9 SHA-256: d91ac7419d838b08c34392ef1e5f56a88e23356c76ebff4ca70caec80074889d
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 hosting, indicating a link farm or SEO spamming operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://leonvi.ru/strik?utm_term=mountain+athlete+warrior+workout PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383912/normal_5fdc73cd20549.pdfIn PDF document text
    • http://winoorama.space/gopesizodoseripuvkukx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369174/normal_605343d035839.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402964/normal_6003a5d586a77.pdfIn PDF document text
    • http://creditscoreusa.info/5005156006wgatk.pdfIn PDF document text
    • http://vkysnaya-eda.site/zodaburepireguwudezena9atdb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471996/normal_60662d0a38648.pdfIn PDF document text
    • http://smartycredit.info/golfbuddy_aim_w10_vs_garmin_s409c376.pdfIn PDF document text
    • http://it50discount.pro/split_rows_into_sheets_exceln5tva.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378607/normal_606e8eba36fe9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b5c4f4dd-ae1f-4f6a-908c-f463551224e4.filesusr.com/ugd/dafd60_1cf98cc2d4584ae497c6a6833e84b14d.pdf?index=trueIn PDF document text
    • https://5e73d190-47a4-4ead-99bf-7e9069f06a16.filesusr.com/ugd/55cc32_6890e12dffeb43ddaa631c0710157a18.pdf?index=trueIn PDF document text
    • https://e6b56e3c-1b88-4cfb-972d-ab1702b0a06e.filesusr.com/ugd/8c0e65_2f2255aaf996410dac76abbb46b227ae.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bifadiwuwileji/finanzas_personales_excel_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/nafoxuda/what_is_quality_management_system_ppt.pdfIn PDF document text
    • https://6376acfe-5884-4251-b3d5-19a03c044549.filesusr.com/ugd/de3d83_1e34127c8819435ca8efc3360d46a5dd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jivala/jee_main_2020_form_pattern.pdfIn PDF document text
    • https://a0d2adcf-75bd-42a9-a42a-c23e1c6e9e1a.filesusr.com/ugd/85c99c_4f5fa715d6544314aab2e877a8e938a8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8f4ed2c-91dd-44f0-8227-4dc5bf6b9a5a/how_to_use_kenmore_500_washer.pdfIn PDF document text
    • https://d525ee04-2a40-494f-8ba9-fee52f7b18ee.filesusr.com/ugd/8b8e24_43d2f3ad2566403caad232dac38bd335.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/46208a6a-8414-450a-87be-552add6cd7ed/where_to_get_the_book_of_enoch.pdfIn PDF document text
    • https://73a1781f-5c9f-4c76-8a11-a8e8c44f336a.filesusr.com/ugd/d9f7b5_d678e7d8c96c44a7a0e10d0a4c9462b2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/062d2c08-b2e1-4c47-9d10-d16a1a3f1901/the_nozzle_forward_book.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_off00014dd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DD1 4756 bytes
SHA-256: fef15f6023007e487ea3033affd332b7fac195d5895ea08f31523e39ac1c40a0
font_01_sfnt_off00015e11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E11 11508 bytes
SHA-256: 17c26984e87edc9221b57bc93af1038a0c715a8e871566512fb97389f9d9d75f