Malicious PDF — malware analysis report

Static analysis result for SHA-256 a27232580d96773f…

MALICIOUS

PDF

74.2 KB Created: 2021-03-01 04:02:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: b1028beb7103e073d301acc7a4611f0c SHA-1: 9de58cbe8c9083859127a379095ca74a0bcd9074 SHA-256: a27232580d96773f6376f493f33dde1b4c8a7ab9b6b70d1cdc3f9c6f49e809a0
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 hosting services, indicating a link farm or phishing operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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/strik?utm_term=french+dialogues+with+english+translation+pdf PDF link annotation
    • https://cdn.sqhk.co/mujowofapubi/guievFp/xezideravisivale.pdfIn PDF document text
    • https://xorapuwo.weebly.com/uploads/1/3/0/8/130873927/wezepavikaxo_relizinugo_wepofifage_melijanijapelis.pdfIn PDF document text
    • http://kudijajipiwi.iblogger.org/71227260577.pdfIn PDF document text
    • https://cdn.sqhk.co/noxisoture/gsjjXgd/soniso.pdfIn PDF document text
    • https://kusebavizekofuk.weebly.com/uploads/1/3/4/0/134098677/kapugosefoza-rofudaz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449599/normal_5ff02c63001c8.pdfIn PDF document text
    • https://cdn.sqhk.co/pawosuku/XicAPgd/tolipinivonedujuranag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367299/normal_5fd2cb4d3367d.pdfIn PDF document text
    • https://jatilesaza.weebly.com/uploads/1/3/4/3/134316516/9475420.pdfIn PDF document text
    • https://cdn.sqhk.co/dobajinorite/jb8hbgf/fallout_shelter_mr_handy_die_in_wasteland.pdfIn PDF document text
    • https://juladuwupib.weebly.com/uploads/1/3/4/7/134763366/juzinudoletejej.pdfIn PDF document text
    • https://cdn.sqhk.co/disovaje/Rjdja3d/lobby_nj_elizabeth.pdfIn PDF document text
    • https://cdn.sqhk.co/nepasibuta/rDMqcja/87978072906.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405202/normal_5ff01e3a42b7a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375890/normal_5fe40dc163bd5.pdfIn PDF document text
    • https://tegeluvosuvu.weebly.com/uploads/1/3/4/8/134873603/dijasevavajefelifo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tixenolas.epizy.com/gevopibejibefevijibidu.pdfIn PDF document text
    • http://zebenasewatoju.rf.gd/doraemon_nobita_adventure_game.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_off0000e3b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B1 5464 bytes
SHA-256: 77549505f27d94209eb3d809af522d65b5689e6e94d36fe3bb0ad3f18a1336ce
font_01_sfnt_off0000f659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF659 11020 bytes
SHA-256: 1ec57b0de10b74367329c93600ec3a6de040a2d013bb9ae775c5d885612791a1

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