Malicious PDF — malware analysis report

Static analysis result for SHA-256 ace3ff1cc4c7ac5d…

MALICIOUS

PDF

88.2 KB Created: 2021-02-14 19:46:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: dcf7717603395f61e6aa6acb02d813c2 SHA-1: 69bd562900abba3f6ec4c3754510c9f064299d76 SHA-256: ace3ff1cc4c7ac5d314301343a575b94396dc83124b61ca6487314ca99911531
244 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to disposable hosting services and appear to be part of a link farm. One critical heuristic indicates a link to known malicious redirector infrastructure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or SEO-based malicious content distribution.

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
  • 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://crophysi.ru/wix?keyword=aia+subcontractor+change+order+form In PDF document text
    • https://worojipe.weebly.com/uploads/1/3/1/3/131382243/waxowix-sirefeweperif-jikifelope.pdfIn PDF document text
    • http://vemasujananexu.22web.org/arturia_v_collection_free_mac.pdfIn PDF document text
    • https://migapivali.weebly.com/uploads/1/3/1/3/131381101/8827519.pdfIn PDF document text
    • https://raxopukefafifi.weebly.com/uploads/1/3/2/6/132695755/zanet-kedijak-vasugukem-vipefonujeni.pdfIn PDF document text
    • https://xajakubadom.weebly.com/uploads/1/3/0/8/130874473/topobipajimojawidi.pdfIn PDF document text
    • https://banafovogakake.weebly.com/uploads/1/3/5/3/135326552/bowexega-kefetopixotinu-mosajesumepebor.pdfIn PDF document text
    • https://darefosal.weebly.com/uploads/1/3/4/6/134601331/xomaxinebip.pdfIn PDF document text
    • https://kedefakoriwo.weebly.com/uploads/1/3/1/1/131164231/gubatariturudaw.pdfIn PDF document text
    • http://buvavarosavadar.iblogger.org/11805461283.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://buwepuxaj.epizy.com/birkenstock_boston_platform_clog.pdfIn PDF document text
    • https://s3.amazonaws.com/lejivugeleguwod/nenuvajer.pdfIn PDF document text
    • http://wunekoxewufomaf.epizy.com/29282735269.pdfIn PDF document text
    • http://jonapepubenej.epizy.com/cadillac_sts_2007_manual.pdfIn PDF document text
    • http://zikukoji.epizy.com/bilejonukitazotuwinuzete.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_off00011da1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA1 5532 bytes
SHA-256: 59afa3d070ca39de7381dec9bb09d9102d8c335d3ff6423c736cb2d0c5c2051b
font_01_sfnt_off0001304c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1304C 10380 bytes
SHA-256: 82014c828cf15a7ea261920b34ef3bb40a020bd96c462ae6d215e1fcf18a8068

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