Malicious PDF — malware analysis report

Static analysis result for SHA-256 8253251411c729a4…

MALICIOUS

PDF

82.8 KB Created: 2021-01-11 19:08:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 1f71a9c953f75227d121df6e4ec8e3bc SHA-1: d3042d7826de51c31b5018ca9a7dd7fffcfc401a SHA-256: 8253251411c729a49ac80eb3ba31e8bf17c6f473750e3f933fa214f376e3d468
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous external URIs pointing to disposable hosting services. The primary purpose appears to be directing users to potentially malicious or phishing websites, as evidenced by the embedded URLs and the 'PDF_SEO_LINK_FARM' heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffnew.ru/123?utm_term=arboreal+alligator+lizard+cost PDF link annotation
    • https://cdn.sqhk.co/mawejoxejobe/bhh2PpA/70555710039.pdfIn PDF document text
    • https://site-1214259.mozfiles.com/files/1214259/40959918845.pdfIn PDF document text
    • https://site-1176357.mozfiles.com/files/1176357/tufurofokoli.pdfIn PDF document text
    • https://site-1199955.mozfiles.com/files/1199955/mesomifojevexufekofet.pdfIn PDF document text
    • https://cdn.sqhk.co/jasojime/nigFgdd/boomerang_jojo_siwa_lyrics.pdfIn PDF document text
    • https://jefabulovonaju.weebly.com/uploads/1/3/1/4/131438419/xezizoluze.pdfIn PDF document text
    • https://cdn.sqhk.co/fedelubu/tfujidr/bejigexuzasilexafefoz.pdfIn PDF document text
    • https://gimepokik.weebly.com/uploads/1/3/1/6/131636980/rufusono.pdfIn PDF document text
    • https://jazaxalik.weebly.com/uploads/1/3/4/4/134488577/4612440.pdfIn PDF document text
    • https://cdn.sqhk.co/fosulavale/gha6ijS/redetekixikaluzogobipij.pdfIn PDF document text
    • https://dumisoxi.weebly.com/uploads/1/3/4/6/134625223/jimosijozijugiten.pdfIn PDF document text
    • https://site-1172154.mozfiles.com/files/1172154/fruits_high_in_vit_c_and_zinc.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_off00010740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10740 5284 bytes
SHA-256: 58288e1c431466b860f4171cbac1c74b14fd451f7e311db010f30edaaec7c9d2
font_01_sfnt_off0001194d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1194D 11120 bytes
SHA-256: 9d6808d10900482519528669d0f1461798f9bae9b5c8956aac62dd49b9f21fca

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