Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d095796caebbf12…

MALICIOUS

PDF

74.0 KB Created: 2021-02-03 01:15:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 3be08a753275a1dfb4729a99d4b4bb13 SHA-1: f927f9dea79753317cbf67b32b14b6e63504978a SHA-256: 7d095796caebbf12632e792158ca1e2baa0a310b02f255b9f65fb8346ab9e52d
126 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous external URIs, many of which point to disposable domains and are part of a link farm, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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 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/aws?utm_term=boss+2013+songs+ming PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4384152/normal_5ffe03ac48881.pdfIn PDF document text
    • http://austritkfa.com/3533481279q7gfy.pdfIn PDF document text
    • https://cdn.sqhk.co/limizolaxa/PrioGjh/43142685265.pdfIn PDF document text
    • http://organicsss.space/tabla_de_trigonometria_senop1m8p.pdfIn PDF document text
    • http://onsideball.info/12983349107pu1k2.pdfIn PDF document text
    • https://cdn.sqhk.co/sixitigoxeto/jjhbDjh/57781681752.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420602/normal_5fdddc1be4fa8.pdfIn PDF document text
    • http://immorta-cross1.club/mejabejesuwuvugikaluvomdh2p2.pdfIn PDF document text
    • http://exemplpusj.com/466693203060pzpc.pdfIn PDF document text
    • https://cdn.sqhk.co/gasubapo/jhCeVUD/kokorivumiseru.pdfIn PDF document text
    • http://gazzsheff.xyz/pibatoromotijojijumilixemuh485.pdfIn PDF document text
    • http://stnold.com/the_brand_flip4n14i.pdfIn PDF document text
    • http://tokio-2020.fun/tavomiregivofinotzqdn1.pdfIn PDF document text
    • http://thedefenseforge.com/zowijifobuzatuziweyjne2.pdfIn PDF document text
    • https://cdn.sqhk.co/wajerewuwer/LriaAjd/rasirozi.pdfIn PDF document text
    • http://salea.site/mekton_zeta_pluscnal5.pdfIn PDF document text
    • http://akfb.online/83433267742mktm6.pdfIn PDF document text
    • http://medyahanem.com/889960822225bcy8.pdfIn PDF document text
    • http://luminar3-download.xyz/intgramme_en_lignesjanp.pdfIn PDF document text
    • http://naturalm.space/pugozipanudi65nef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491686/normal_5fdce25d6c619.pdfIn PDF document text
    • http://bandalet.club/349862222586qsjs.pdfIn PDF document text
    • http://shoop-fo.ru/business_english_for_beginnersjp2gd.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
    • 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_off0000d808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD808 4796 bytes
SHA-256: c8e434dd0d24ff7d01bab98df3fcc8671eaea715218db340a8d79046ecfaee59
font_01_sfnt_off0000e82f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE82F 10640 bytes
SHA-256: 3342dc0c179531ec5b6a7d749579a80598568b8d4da9a797ff8ce2789d8aa486
font_02_sfnt_off00010c77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C77 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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