Malicious PDF — malware analysis report

Static analysis result for SHA-256 411b02f47f3a83b6…

MALICIOUS

PDF

64.6 KB Created: 2021-03-10 20:02:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 045b99c6a80d0aa8bd6ad06bdd43e097 SHA-1: 6478734df3e7a98f9354b150c895ed7f29fda5a2 SHA-256: 411b02f47f3a83b66097f33075af50a4deb489c5aa13c64286bda559c91dc06b
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The primary embedded URL, https://soxebez.ru/wb?keyword=karcher%20411a%20pressure%20washer%20problems, indicates a lure related to specific product issues. The ML classifier and ClamAV detection strongly support its malicious nature, likely as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://soxebez.ru/wb?keyword=karcher%20411a%20pressure%20washer%20problems PDF link annotation
    • http://nesobaka9.xyz/distinctively_local_report_to_guide_housing_designfq2fn.pdfIn PDF document text
    • http://yognat.space/zombie_apocalypse_moviedhix5.pdfIn PDF document text
    • http://flylovel.com/gatehouse_keyed_entry_locksetf96gx.pdfIn PDF document text
    • http://finansi-7.online/87837876249170jp.pdfIn PDF document text
    • https://cdn.sqhk.co/fesakesovoka/jhaiebp/crossme_nonograms_2._97.pdfIn PDF document text
    • https://cdn.sqhk.co/kidatufo/ykxSDgc/54721985455.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e25b5f36-ee09-4010-8803-019b2853a23b.filesusr.com/ugd/c34eac_e7a0ead51e7c45bb8e019e6be2783301.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ff4e3a9-6318-4025-803d-0c951cf72af4/xajenisat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b62d30ef-e1cd-4d53-b004-a3f8678d0a1d/vasidijevigux.pdfIn PDF document text
    • https://26c1613e-5d28-4fa3-89cb-3d2c9ab59faf.filesusr.com/ugd/fe83c3_f49aa27f997043e0991eb32af60d2831.pdf?index=trueIn PDF document text
    • https://31c8a3d4-0132-49f1-a04f-09c79d03e01f.filesusr.com/ugd/a4da84_c5dabb8c42184b19b44eb0bb571ec089.pdf?index=trueIn PDF document text
    • https://63aa7d51-6c54-48cc-ac87-b710a0da19c3.filesusr.com/ugd/c8d394_4ca4f120564248a28953abf0b9ff4a16.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c58fa207-6807-47a7-8c9f-bf03f7abc7b1/atlas_copco_compressor_parts_uk.pdfIn PDF document text
    • https://12c48f50-3553-44c7-a31c-19fc5df83d07.filesusr.com/ugd/7e0eb0_6350ce81ddd74d2cb8e264bee250ee13.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cda5228f-69ee-42f5-a481-a31c885da7e5/dodge_ram_aftermarket_body_parts.pdfIn PDF document text
    • https://ce099f17-eb12-430b-a452-8d789b3ee5a8.filesusr.com/ugd/aef5b7_9899c795a56f4de2b08eec8b5a1ef48d.pdf?index=trueIn PDF document text
    • https://2f2ab42d-e0b4-4bd3-aa50-2430da1ff5fc.filesusr.com/ugd/eaf48f_840f7e205a4a44b39ea32dd48d1870b5.pdf?index=trueIn PDF document text
    • https://937a8a2d-b41a-4163-aff8-eda6db263557.filesusr.com/ugd/21e6f2_d893189a7bd84db79f943bd32f84f5d9.pdf?index=trueIn PDF document text
    • https://84d5b3ab-51dd-4312-87b7-51df18fb3b26.filesusr.com/ugd/9ea9b6_55d2e0b9c2de4f57a55671e547772d3c.pdf?index=trueIn PDF document text
    • https://35e1cc1d-5f6c-4a41-9b1b-b9ae8dddc97a.filesusr.com/ugd/351eee_c587b4c873ae4e878cc43bfcddb45c8c.pdf?index=trueIn PDF document text
    • https://45dcde1a-aed5-4138-b95e-a0f768a283bf.filesusr.com/ugd/89441e_141a1df40dd74839b6f7f08efaaab250.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC202 5516 bytes
SHA-256: a322d6e9f1487a2193fac9d2e0f0f3e3900b376650915624bffade66ee9e3cc3
font_01_sfnt_off0000d4b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B6 9448 bytes
SHA-256: 22d9515e90b540f4caa831ee3684ba43a91f0a94e1043657804d6ba017fd8371