Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3a91814eb4660f0…

MALICIOUS

PDF

72.5 KB Created: 2021-01-18 03:35:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 586555923df32d8639a59c87e67ba603 SHA-1: d4fea929de20855084133c84f10a7161b2caa045 SHA-256: f3a91814eb4660f0555bc3622c76247f4071d40a0c86a782359a8320dfecd08e
244 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded URLs, many pointing to disposable hosting and redirectors, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious content or phishing pages. No scripts were extracted, but the PDF structure itself is used to host and distribute these malicious links.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/123?utm_term=kite+runner+audiobook+chapter+2 In PDF document text
    • https://juluvolalo.weebly.com/uploads/1/3/4/4/134435755/katotepeje-zuloxamosipebo.pdfIn PDF document text
    • https://cdn.sqhk.co/munuluxel/I7Zjaid/buttons_the_musical_dvd.pdfIn PDF document text
    • https://cdn.sqhk.co/guzamuvi/hcagdja/dunufaduperekijuja.pdfIn PDF document text
    • https://polerobozugewif.weebly.com/uploads/1/3/4/3/134344868/belekexefal.pdfIn PDF document text
    • https://site-1215102.mozfiles.com/files/1215102/mujadimitulol.pdfIn PDF document text
    • https://cdn.sqhk.co/mogidamiko/XiNHSiG/fisapapijelepedati.pdfIn PDF document text
    • https://site-1178057.mozfiles.com/files/1178057/87099679614.pdfIn PDF document text
    • https://site-1172264.mozfiles.com/files/1172264/25017168098.pdfIn PDF document text
    • https://site-1166618.mozfiles.com/files/1166618/cinemark_jockey_plaza_lima_peru.pdfIn PDF document text
    • https://cdn.sqhk.co/dawolesirip/jfjc4jd/63174556728.pdfIn PDF document text
    • https://cdn.sqhk.co/nuroteditu/NghojdA/vagakigavoziterome.pdfIn PDF document text
    • https://site-1168232.mozfiles.com/files/1168232/jotawogovetewasejole.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://mujujum.epizy.com/rezapesixenosinixawixe.pdfIn PDF document text
    • http://xexobazetozi.epizy.com/37165132897.pdfIn PDF document text
    • http://totofexux.epizy.com/child_44_2015.pdfIn PDF document text
    • http://wujukigow.rf.gd/nuvepakexewo.pdfIn PDF document text
    • http://gedonisezif.epizy.com/articulate_storyline_360_create_template.pdfIn PDF document text
    • http://gefegasoro.epizy.com/apr_performance_mustang.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1CB 5140 bytes
SHA-256: d963908ceb4abb7c0ade7e2092c64994d10f08823119d9b3300ed3fe96e38c32
font_01_sfnt_off0000e32c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE32C 10120 bytes
SHA-256: 495c28b2fffc230dbc8611b4e5bd1f386fb1d7b556312e8fceaa798b30305489
font_02_sfnt_off00010500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10500 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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