Malicious PDF — malware analysis report

Static analysis result for SHA-256 583993a4ad3045dd…

MALICIOUS

PDF

71.1 KB Created: 2021-02-02 08:16:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 1c238560bdcbf23ff6adba6e51a2096f SHA-1: d5665fea76d78cb4b2ef7231f1b951542d37c9aa SHA-256: 583993a4ad3045dd60aeeae7a4d7a7a01283e6aefb6691d2b574b79a5a20cfdc
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious websites for further exploitation or credential harvesting. No scripts were extracted, but the PDF structure itself is indicative of a malicious campaign.

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/123?utm_term=florida+algebra+1+eoc+study+guide PDF link annotation
    • https://zawasofolebu.weebly.com/uploads/1/3/4/9/134902788/vazatem-wejeguvu-tudusikejo.pdfIn PDF document text
    • https://cdn.sqhk.co/bowevuva/hcQNgj8/puppet_soccer_world_cup_2014.pdfIn PDF document text
    • https://wixinuwexe.weebly.com/uploads/1/3/0/7/130739185/xupudaliw.pdfIn PDF document text
    • https://zulevoto.weebly.com/uploads/1/3/2/6/132696122/gukinorasozubexob.pdfIn PDF document text
    • https://kupifibadobibe.weebly.com/uploads/1/3/4/5/134512214/gosekut.pdfIn PDF document text
    • https://jevilorusijugif.weebly.com/uploads/1/3/0/8/130874204/loxosiwuz_bomivodikasok_vemisumofogiv.pdfIn PDF document text
    • https://cdn.sqhk.co/gebitasixa/eGjbMjj/tujirejitesunolupak.pdfIn PDF document text
    • https://xonaxogurevof.weebly.com/uploads/1/3/1/4/131453171/b3f8a4ff27168d5.pdfIn PDF document text
    • https://cdn.sqhk.co/ritapabinap/BlJJ4ge/mobile_recharge_offers_vodafone.pdfIn PDF document text
    • https://mokufanogokotim.weebly.com/uploads/1/3/1/4/131406807/janizinuposisen.pdfIn PDF document text
    • https://cdn.sqhk.co/jifegusewe/DgcRPCu/jexakakomotokikumugerasub.pdfIn PDF document text
    • http://urro-hu.com/outward_best_buildq7m61.pdfIn PDF document text
    • https://cdn.sqhk.co/bolukawet/dMRDQHR/17266534188.pdfIn PDF document text
    • https://vuzaruluweketex.weebly.com/uploads/1/3/4/4/134478477/6550212.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d60d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD60D 5356 bytes
SHA-256: 4c22ebebb34d596ef2f8430c633784401920492e53c38aab74e066022db4db6d
font_01_sfnt_off0000e85c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85C 11000 bytes
SHA-256: 3d5a65eb65d3ddfbe74d33c0bbec43ded89ca75f4a8e4d9f26e175a24c2ffe0e

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