Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7a4c9c8b09b705f…

MALICIOUS

PDF

98.1 KB Created: 2021-02-26 12:13:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 6a992d5550fcb34139f09edcec6f7154 SHA-1: 34403dae09de0509a7ba7b32ea3baf5032bd34ee SHA-256: a7a4c9c8b09b705f08d3c7a7de1160f55ff568503f08df0cc7cd7c6ec801ef79
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains and Weebly subdomains, indicating a link farm or redirection scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' point to an attempt to drive traffic to potentially malicious content.

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://botokaw.ru/wix?keyword=cots+mlb+contracts+cardinals PDF link annotation
    • http://nasty666.space/jumilaregolamekf0zi6.pdfIn PDF document text
    • https://gigufeti.weebly.com/uploads/1/3/4/6/134633464/b101a34ca39.pdfIn PDF document text
    • https://ligelonajoka.weebly.com/uploads/1/3/1/4/131407163/dibig.pdfIn PDF document text
    • http://storedubai.shop/how_much_does_saga_dating_costll1v3.pdfIn PDF document text
    • http://prosucre.pro/xujof9clfw.pdfIn PDF document text
    • http://bnatural.space/watch_dogs_2_performance_modsrd451.pdfIn PDF document text
    • http://hellesypakk.online/35217892496mcynd.pdfIn PDF document text
    • https://jajugodi.weebly.com/uploads/1/3/4/9/134902248/9262089.pdfIn PDF document text
    • http://kulinar2020.site/a_random_walk_down_wall_street_editionsd328s.pdfIn PDF document text
    • https://vasukoxenubepez.weebly.com/uploads/1/3/4/4/134475355/punepodipewiguzo.pdfIn PDF document text
    • http://deutschebank-meine.com/76756998346tqqhq.pdfIn PDF document text
    • https://sukuwakutas.weebly.com/uploads/1/3/4/6/134603616/4989240.pdfIn PDF document text
    • https://tebojejuket.weebly.com/uploads/1/3/4/7/134764489/nugodinagu_wewegizuzex_vanukumok.pdfIn PDF document text
    • http://hackins.site/hsk_level_4_past_paperstu6zk.pdfIn PDF document text
    • http://cabinetsly.xyz/how_to_use_java_for_web_applicationsro9ay.pdfIn PDF document text
    • http://salonlabs.xyz/good_group_topicsifscv.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_off00013922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13922 5128 bytes
SHA-256: daa33a88e5171a94ad61624cb641d775055e55adafa3b9581f80bea41e3340be
font_01_sfnt_off00014a6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A6C 15748 bytes
SHA-256: 6e72ea2e8db41bcd76ea960ea37e53e5d777e25891a34123bf4095618e4ccfed

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