Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8559dfc48e29df6…

MALICIOUS

PDF

66.2 KB Created: 2021-02-15 09:06:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: d1f7786c4568e87d0bb5f104283102ee SHA-1: 9dd80523c46905237877ff7c117587d716f1be81 SHA-256: d8559dfc48e29df6f740cf373449ad13ff64a823a7afad64f8c9acbc6175132d
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm containing numerous external links to potentially malicious content hosted on disposable domains. The ML classifier and ClamAV also identified it as malicious. While no scripts were explicitly extracted, the PDF structure and the high volume of external links suggest an attempt to manipulate search engine results or redirect users to malicious payloads.

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=phoenix+fire+department+study+guide PDF link annotation
    • https://cdn.sqhk.co/xavonepez/hJggrgg/motorcycle_shop_near_me_open_on_sunday.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413563/normal_601dbda5718a0.pdfIn PDF document text
    • https://digagewopaloz.weebly.com/uploads/1/3/4/6/134634746/mirakezasev-zuborid.pdfIn PDF document text
    • https://pekedepak.weebly.com/uploads/1/3/5/3/135399439/0fc582e31b53.pdfIn PDF document text
    • https://vikurevago.weebly.com/uploads/1/3/1/6/131606257/a600eb4c.pdfIn PDF document text
    • https://cdn.sqhk.co/tezabulaw/aigjfjc/perfect_flow_ironing_board_cover.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/xekil.pdfIn PDF document text
    • https://cdn.sqhk.co/rijujonakuje/EEPigtB/66908156067.pdfIn PDF document text
    • https://cdn.sqhk.co/feripamapuv/6RCl1DN/tiwuxusagixu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452837/normal_600720637c072.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417997/normal_5ff638703b456.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488141/normal_5fd8f23b5ea66.pdfIn PDF document text
    • https://cdn.sqhk.co/rikopekela/gia6pgd/table_tennis_touch_mod_apk_and_obb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tuwojusedikemi.rf.gd/42928619975.pdfIn PDF document text
    • http://jepisaf.epizy.com/11155955790.pdfIn PDF document text
    • http://limedebenilaz.rf.gd/lejopaparukonuterazij.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_off0000c339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC339 5592 bytes
SHA-256: 71a1e201c7cad482a5a8b635205eb23aec7d6271dce62be4aa11dc8fa5bb1e5e
font_01_sfnt_off0000d629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD629 10624 bytes
SHA-256: edf98bfc98dd4e5d713440cd8737fb350e1d2dd559f17fbe398da9066062d54d

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