Malicious PDF — malware analysis report

Static analysis result for SHA-256 c69deaec687c9ebe…

MALICIOUS

PDF

101.3 KB Created: 2021-02-13 01:58:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 3e3b92ddf59cc2c6e6a07a4977a0d59d SHA-1: 7ac676634560386f89d90d6283e71346989ec48c SHA-256: c69deaec687c9ebe940f43862e1fd001c294e98385c937a7ef7a9058beef137f
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO spamming operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/wix?keyword=flocabulary+unit+3+mandela+is+free+answer+key PDF link annotation
    • https://fonekukiko.weebly.com/uploads/1/3/5/3/135393218/nudezew.pdfIn PDF document text
    • http://xubixaxar.22web.org/top_hd_graphics_android_games.pdfIn PDF document text
    • https://tesegedoveveda.weebly.com/uploads/1/3/4/8/134891870/5944711.pdfIn PDF document text
    • https://nuguzawopaji.weebly.com/uploads/1/3/4/0/134040365/3499732.pdfIn PDF document text
    • https://nojugebi.weebly.com/uploads/1/3/4/3/134321301/c9c48.pdfIn PDF document text
    • https://simefaburiso.weebly.com/uploads/1/3/0/8/130814859/f199b2c2f84.pdfIn PDF document text
    • https://lozusometuzasop.weebly.com/uploads/1/3/4/7/134741376/143973.pdfIn PDF document text
    • https://gojajegu.weebly.com/uploads/1/3/6/0/136050346/4ff74.pdfIn PDF document text
    • https://jagusidenoz.weebly.com/uploads/1/3/4/9/134902343/94e4dff.pdfIn PDF document text
    • https://bipinudaw.weebly.com/uploads/1/3/4/7/134718108/dawulasomuna.pdfIn PDF document text
    • https://rubexanow.weebly.com/uploads/1/3/5/3/135346757/konexutovimaj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vedezaduxi.epizy.com/87665248156.pdfIn PDF document text
    • http://gimusatis.rf.gd/31869111634.pdfIn PDF document text
    • https://s3.amazonaws.com/votubukaxogilix/ca_final_books_online.pdfIn PDF document text
    • https://s3.amazonaws.com/seriposuj/best_answers_interview_questions_biggest_weakness.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_off000140bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140BF 5684 bytes
SHA-256: 1915d162c30ec198f48f1d2072bc31c0bc755f16e6ec38a8b92f91e6f2b26a99
font_01_sfnt_off00015418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15418 16700 bytes
SHA-256: 6c50bc98d8814593457977ca463ce483c7c08767474968ff526465a5bf80b6c2

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