Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7ddde2dbb7a3610…

MALICIOUS

PDF

74.6 KB Created: 2021-06-08 15:43:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 8125a87b0c30c703b6cb8332344d0740 SHA-1: 49ee7e3f08d2102df517fde4a482b16b544b7b1d SHA-256: b7ddde2dbb7a3610373ee55139f1d8e9d2c1e4654de7c9805b2c41d4cd736ed5
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The document body, though heavily obfuscated, appears to reference a user manual, which is likely a lure to direct users to these malicious or spammy external sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

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
  • 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://crysiq.ru/pbw?utm_term=husqvarna+automower+315x+user+manual PDF link annotation
    • https://kimonasisu.weebly.com/uploads/1/3/5/4/135400987/376c54d.pdfIn PDF document text
    • https://sibibogug.weebly.com/uploads/1/3/5/9/135990875/xumixuxulitasa.pdfIn PDF document text
    • https://tobuzedatenet.weebly.com/uploads/1/3/4/3/134322281/1c0b3788b.pdfIn PDF document text
    • https://kazedodaregiz.weebly.com/uploads/1/3/4/3/134368633/zutodakujoraz-mazafiwuwoto-lexidativajip-pafunofipuluxiw.pdfIn PDF document text
    • https://jozudepixivi.weebly.com/uploads/1/3/4/6/134682498/1936779.pdfIn PDF document text
    • https://gofuzuxelizexo.weebly.com/uploads/1/3/5/3/135391542/rekib.pdfIn PDF document text
    • https://xatomurukazaj.weebly.com/uploads/1/3/4/3/134378662/8841204.pdfIn PDF document text
    • https://bejokuwawij.weebly.com/uploads/1/3/4/6/134688199/sanonaleduwedewupu.pdfIn PDF document text
    • https://dozetiwe.weebly.com/uploads/1/3/1/8/131856451/rutugomasovix.pdfIn PDF document text
    • https://vorujefam.weebly.com/uploads/1/3/4/3/134322124/sisoxupazeg.pdfIn PDF document text
    • https://pexazunawilaga.weebly.com/uploads/1/3/4/2/134265520/389926.pdfIn PDF document text
    • https://razolonupul.weebly.com/uploads/1/3/4/8/134888498/6cb17c.pdfIn PDF document text
    • https://jafoxexaromomev.weebly.com/uploads/1/3/5/2/135296472/b27050.pdfIn PDF document text
    • https://pagurewitapusak.weebly.com/uploads/1/3/4/6/134632053/de236d2a7885.pdfIn PDF document text
    • https://subogepaweb.weebly.com/uploads/1/3/2/3/132302814/7737edc53a8d4f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f75ec2a9-3f2a-4727-aab0-94fc4edc992d/21019862792.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee58f75b-55e8-42f3-8335-8c8cdc36701e/swann_enforcer_review.pdfIn PDF document text
    • http://paditoxef.pbworks.com/f/fundamentos_de_marketing_philip_kotler_descargar_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a641c343-61ff-440b-a12c-209e904c2e62/vegetarian_meal_ideas_for_fussy_eaters.pdfIn PDF document text
    • http://jutifakukap.pbworks.com/w/file/fetch/144652524/73345804280.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_off0000e6de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6DE 5480 bytes
SHA-256: 2fef80aba9d6fb110800b109a750c1e081d4efe0c6543ff2c52eb04fcba3ccf1
font_01_sfnt_off0000f98d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF98D 10480 bytes
SHA-256: 4979ec11710f47ca5a994c641d92b13dbb5a8aeeb497d2c9ca40eedbf417d64e