Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d8adc023b6dbcea…

MALICIOUS

PDF

70.2 KB Created: 2021-03-11 21:41:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a42d2171acbed5f8cb06a4d28602e8b SHA-1: bdc2534b0d5b570116d2c9e7128388fdec80f948 SHA-256: 1d8adc023b6dbcea2f7bcf6b17466c1c008b20f35e477997398d5976c3bdfa0a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are hosted on disposable or suspicious domains, indicating a link farm or SEO spam tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mezovuduw.ru/award?keyword=prepositions+and+adverbial+particles+heaton+pdf
    • https://vuvitujenus.weebly.com/uploads/1/3/4/3/134305132/2673895.pdf
    • https://lupadezojoxus.weebly.com/uploads/1/3/4/3/134318565/6630787.pdf
    • https://cdn-cms.f-static.net/uploads/4408996/normal_603beddb5b030.pdf
    • https://kajilavenusifo.weebly.com/uploads/1/3/2/6/132683330/kopewag.pdf
    • https://cdn-cms.f-static.net/uploads/4377662/normal_603e97b59806a.pdf
    • http://soguged.22web.org/kuguladakigoxozoj.pdf
    • https://cdn.sqhk.co/norifasil/fifbgeh/gijefunilipig.pdf
    • https://cdn-cms.f-static.net/uploads/4370525/normal_6028339d94631.pdf
    • https://zavowajasobi.weebly.com/uploads/1/3/1/4/131406950/nexedixeparof.pdf
    • https://cdn.sqhk.co/dewozoju/bzgf0WY/sexadu.pdf
    • https://cdn-cms.f-static.net/uploads/4369905/normal_602420cf60196.pdf
    • https://goguribepolim.weebly.com/uploads/1/3/0/7/130739596/17cb9ee065e2b05.pdf
    • https://xexafuru.weebly.com/uploads/1/3/1/0/131070851/4608708.pdf
    • https://pisubemiduburor.weebly.com/uploads/1/3/1/3/131380627/666ad6c5fd81a1.pdf
    • https://static.s123-cdn-static.com/uploads/4369923/normal_5fcf9663e8173.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://254b3b0b-79dc-4992-827c-fd4bb3db3178.filesusr.com/ugd/f515ca_1202e355cae14e23914ebdff228755f7.pdf?index=true
    • http://kesekerezox.epizy.com/event_planner_free_template.pdf
    • https://d56a38bf-d62e-453c-9b5b-5b2fe88aea46.filesusr.com/ugd/359e64_9ee4d2a1578c44699443970a5ccae125.pdf?index=true
    • https://d8d691c7-cf48-432b-bece-a54604b57851.filesusr.com/ugd/1e3a4b_ddd885f39e3e4615aa9289f1e10f1941.pdf?index=true
    • http://vejebuta.rf.gd/41825276983.pdf
    • https://c84ffda1-e72a-45fa-8ce8-a771970cf326.filesusr.com/ugd/9fd656_824dd5f5267f4b1b967afdf5d437ff6f.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3b6.bin
f3817d651027ac304b68b1cf2c5716776f1b4512caf42f910971d3dbd8c4f692		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B6 5444 bytes
font_01_sfnt_off0000e633.bin
2db078ce848193bd9a9c2dfb3b871d501f5fbe54af1a4eb5f71eede671dc8fcd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE633 10900 bytes

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