Malicious PDF — malware analysis report

Static analysis result for SHA-256 7af4a073e72e8205…

MALICIOUS

PDF

67.7 KB Created: 2021-02-26 14:01:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 0abe0ebdd5d4e7ee776a02806eb24792 SHA-1: 6d6d8d9529b6765bfc6a0a996cc899a4ead7737e SHA-256: 7af4a073e72e82051c013dcb6fd152d60b3afbb2286fc3fdc812ec51671e3894
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many pointing to disposable domains and Weebly subdomains, indicating a link farm or SEO spam operation. The embedded content suggests a lure related to car value inquiries. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these external links.

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://leonvi.ru/award?keyword=what+is+the+value+of+a+2007+audi+a4 PDF link annotation
    • https://nukanomipixi.weebly.com/uploads/1/3/2/7/132740264/5938383.pdfIn PDF document text
    • https://xogevowizixid.weebly.com/uploads/1/3/0/9/130969953/xenataf-turefu-lugamowoseji.pdfIn PDF document text
    • https://xotozefubineru.weebly.com/uploads/1/3/4/5/134576546/rebina_dipebus_lipokezera.pdfIn PDF document text
    • https://dagigofeno.weebly.com/uploads/1/3/4/8/134887245/0ee7fe0556f597.pdfIn PDF document text
    • http://todayshop.website/67889799356p3rjp.pdfIn PDF document text
    • https://gujowidupisume.weebly.com/uploads/1/3/4/1/134131448/gemarefekawim_malopemanaz_zukales.pdfIn PDF document text
    • https://dudunetexuzo.weebly.com/uploads/1/3/1/3/131379759/fesejebin-jujelorigokesa-kijepinapiza.pdfIn PDF document text
    • http://autobaff.xyz/tezetijazirotiderugadonueev1o.pdfIn PDF document text
    • https://lixavoje.weebly.com/uploads/1/3/0/9/130969842/debaxigegosavex_lekomug_jedejato_goloj.pdfIn PDF document text
    • https://mekapejodefab.weebly.com/uploads/1/3/4/7/134740006/1706056.pdfIn PDF document text
    • https://ladukupubavar.weebly.com/uploads/1/3/0/7/130776836/3715842.pdfIn PDF document text
    • https://valodoxajub.weebly.com/uploads/1/3/4/4/134435871/4391266.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jibipadesubamom.epizy.com/95845045840.pdfIn PDF document text
    • http://wosidekole.rf.gd/26805613744.pdfIn PDF document text
    • http://fufibilola.epizy.com/36978291950.pdfIn PDF document text
    • http://siromalezevupag.rf.gd/fedakavisamaba.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_off0000ccfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCFC 5412 bytes
SHA-256: 490fb0e38fb0c6188aaeacce8ca70d1b7e9cdd05ab4068fc970521509ba127b4
font_01_sfnt_off0000df84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF84 10144 bytes
SHA-256: 0e4d4a1af30ddfd77c338349404a9b02df673c5b12671e1f1948ae067c93aa34

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