Malicious PDF — malware analysis report

Static analysis result for SHA-256 673d609f1f63613d…

MALICIOUS

PDF

82.2 KB Created: 2021-03-06 17:15:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: c6afb644e07046591fb31536ff7016c5 SHA-1: b9a5105d4967622382ea0f4052f7d409ded5b473 SHA-256: 673d609f1f63613d4faa85bdd1372956a952fae0128dc6451407151e00c6c5b4
126 Risk Score

Malware Insights

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

The PDF document contains numerous external links, a common tactic for SEO spam or to redirect users to malicious websites. The 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics indicate a large number of links hosted on potentially disposable domains. While no scripts were explicitly extracted, the ML classifier flagged the PDF as malicious, suggesting embedded malicious content or obfuscated links designed to exploit vulnerabilities or lead to further compromise. The document body is heavily obfuscated, preventing a clear understanding of its direct lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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/wix?keyword=horizon+t81+treadmill+price PDF link annotation
    • http://3gusevshop.website/web_tycoons_pvt_ltds5w2w.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474992/normal_5ff7642a1d40d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388052/normal_6028fa0f55ca2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369499/normal_603e7de42f666.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381105/normal_601245dd6fa14.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476567/normal_5fed38c71e9d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460449/normal_5fe6b756ef7a4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490123/normal_5fcd7fa9add0e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468572/normal_602e4dec3c53b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468255/normal_60363723efa13.pdfIn PDF document text
    • http://miiliioner.xyz/36432729866hau3v.pdfIn PDF document text
    • http://store50off.info/90919568133twja9.pdfIn PDF document text
    • http://pokupka.space/one_thousand_and_one_nights_urduy9m8r.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416301/normal_5ff3be62e74d2.pdfIn PDF document text
    • http://kpupnov.pro/77172036223vvhsz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://41be308f-8a64-4dec-8b30-4937605be974.filesusr.com/ugd/f042fe_c5680f37e352412684b318f15803d6d9.pdf?index=trueIn PDF document text
    • http://nixutemexeteted.rf.gd/how_to_play_guitar_beginners_in_hindi.pdfIn PDF document text
    • https://s3.amazonaws.com/genukopapovixo/25981175784.pdfIn PDF document text
    • https://s3.amazonaws.com/tarajix/bandwidth_actual_speeds.pdfIn PDF document text
    • https://s3.amazonaws.com/fuvidokibet/fatepuvig.pdfIn PDF document text
    • http://kamizawub.epizy.com/burironumovofivaxofi.pdfIn PDF document text
    • https://4cd5a77a-be8d-44ba-8952-4177873115c4.filesusr.com/ugd/930050_2566387a69b54d7ea9ca57fc71a87c66.pdf?index=trueIn PDF document text
    • http://dogirajuwuxo.epizy.com/logufejazudufilagopokuko.pdfIn PDF document text
    • https://s3.amazonaws.com/peveziwoguxuzam/kisotogirude.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF696 5088 bytes
SHA-256: 51a785a708529a36dfa9f458adb02c940c4c58698a3c89ff6e01c5b4f7707828
font_01_sfnt_off000107c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C5 10992 bytes
SHA-256: c7c9f6c3c6e111d6f621a033601beedb687aaed8fb71f8e0836ae3b234ec2fb7
font_02_sfnt_off00012d31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D31 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3