Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d92901c40a017f0…

MALICIOUS

PDF

80.2 KB Created: 2021-04-04 18:21:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 29f80911734dca1ecfc72ed53b8d6bf9 SHA-1: 8a3d1556b5d8879404790ebc6ecf58a2a85c25a2 SHA-256: 7d92901c40a017f0b05f419ee043afa6dde2f05b881e83b24e3e967e1947cce8
244 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to disposable hosting or known malicious redirectors, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. While no scripts were explicitly extracted, the presence of numerous external links suggests an attempt to redirect the user to malicious sites, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=what+are+the+three+branches+of+government+and+their+responsibilities+pdf In PDF document text
    • http://nitesufi.sportsontheweb.net/what_is_the_main_difference_between_awt_and_swing_in_java.pdfIn PDF document text
    • http://juwoniki.getenjoyment.net/18687330943.pdfIn PDF document text
    • https://tabivivefevevu.weebly.com/uploads/1/3/4/8/134889686/rizixonapa.pdfIn PDF document text
    • http://pinezotamex.getenjoyment.net/32155283062.pdfIn PDF document text
    • http://kirakexig.mypressonline.com/possessive_adjectives_vs_possessive_pronouns.pdfIn PDF document text
    • https://duxetaxegijojem.weebly.com/uploads/1/3/4/8/134870405/jikusadekobinarozag.pdfIn PDF document text
    • http://metazoaapc.fun/galileo_telescope_setupwao0a.pdfIn PDF document text
    • http://magnifioco.site/38681717570c8nny.pdfIn PDF document text
    • https://bonopabugo.weebly.com/uploads/1/3/4/5/134581776/e7b919a0f5fc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nefigubisi.epizy.com/gapajujilixuferi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/644a374e-0577-484c-91b5-289fbce11124/dizibipezajaxevedomukof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1b4f0c2-cda6-4d4e-9ce6-0b5eac517ef2/mukubitivubuforosametuk.pdfIn PDF document text
    • http://kopolug.myartsonline.com/tennessee_immunization_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a6257dd-7b64-45b3-9111-18f88eaa4eca/toro_power_max_826_le_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07cf17fa-6cce-4d1e-940e-b6d853320d83/89014923221.pdfIn PDF document text
    • http://jarunitilor.rf.gd/49870257678.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55382574-99e8-4a78-9264-9d42a018050e/microsoft_project_online_course_free.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_off0000fa7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7B 5780 bytes
SHA-256: 67d7fdede7acff594c6d9f9a14aebbf5053ce3932f3a4f083a847eb37bc67b3b
font_01_sfnt_off00010e13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E13 10676 bytes
SHA-256: 8c936225772a8246df20acf494e90ee8eb2afeec2f72a807dfb7d0f49ebadbe8

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