Malicious PDF — malware analysis report

Static analysis result for SHA-256 23d279eb17a87e6f…

MALICIOUS

PDF

67.1 KB Created: 2021-01-12 19:11:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 1c4c298c2edf02f50c7b7177b3921352 SHA-1: f4b5f5c5c8bee19e4f1e8a75f9191df264c1ed50 SHA-256: 23d279eb17a87e6fc7c75c917696813878e4f7dc75611286ccac8472acc9ce75
244 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or known malicious redirectors. The heuristic firings indicate this PDF is part of a link farm designed to redirect users to malicious infrastructure. ClamAV and ML classifiers also flagged this file as malicious, likely due to its redirection capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffking.ru/wb?keyword=proguides%20valorant%20review In PDF document text
    • https://taretowixulu.weebly.com/uploads/1/3/1/0/131070971/redopuxosubaritonere.pdfIn PDF document text
    • https://cdn.sqhk.co/jemajujo/hhijegy/good_captions_for_cover_photos_on_facebook.pdfIn PDF document text
    • https://mulomaninivoxom.weebly.com/uploads/1/3/1/4/131437045/7399276.pdfIn PDF document text
    • https://cdn.sqhk.co/nudavede/vYjga2Y/febunakono.pdfIn PDF document text
    • https://dimulawi.weebly.com/uploads/1/3/4/3/134380670/d9524b842d8c.pdfIn PDF document text
    • https://kenemujawov.weebly.com/uploads/1/3/4/6/134645985/wopibidudofewe_kupavezo_xirororib_rivoladanito.pdfIn PDF document text
    • https://dovizitozul.weebly.com/uploads/1/3/1/4/131408131/sudolenexavona.pdfIn PDF document text
    • https://sodefabufu.weebly.com/uploads/1/3/4/4/134473286/7265054.pdfIn PDF document text
    • https://morozosewiveloz.weebly.com/uploads/1/3/4/3/134387595/4a8e55c9976208.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vabemavuputenif/adobe_photoshop_free_7._0_filehippo.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxime/juxifadipevuwojuwed.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_off0000c8d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8D2 5148 bytes
SHA-256: fe06ee0aec52dc87842354db2f717fc5838a33b2355b49d338c8da1db6b46cfb
font_01_sfnt_off0000da73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA73 11060 bytes
SHA-256: 937577da3e18952eb89c91ec002ea30ae89d78bf81b74712d5d27fa6586e945a

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