Malicious PDF — malware analysis report

Static analysis result for SHA-256 9990f4980df42dce…

MALICIOUS

PDF

69.0 KB Created: 2021-03-12 20:49:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 7d6c4463e4890ad470486ff8e9f42675 SHA-1: af7532dd3f2e33cc0039cd965b12ac27695d4f8e SHA-256: 9990f4980df42dce8ad7672650a2a959887521148f65e44e5f7cdccd1eeb8670
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The presence of a URL with a 'utm_term' parameter further indicates a phishing or spamming campaign. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://vilenefex.ru/123?utm_term=bhojpuri+dj+song+video++2019 PDF link annotation
    • https://cdn.sqhk.co/gafisasiwu/jhq6jhp/33439897683.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467007/normal_5fd34364eeaf9.pdfIn PDF document text
    • https://cdn.sqhk.co/nogegamapagi/jgc9gfU/7378045453.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419654/normal_601cf2663a605.pdfIn PDF document text
    • https://cdn.sqhk.co/susiwozobo/qhgjgji/refororimudaruril.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381551/normal_604422204613c.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/rabewiruzitewa/96145883910.pdfIn PDF document text
    • https://cad90261-f038-4e8a-b384-2e0e37e6cb8c.filesusr.com/ugd/4c4e45_0b20e5272ba8423c99975af802888873.pdf?index=trueIn PDF document text
    • https://b7e73dfe-ad35-4791-b4f7-7500f5b7882c.filesusr.com/ugd/bc79a4_016e397e8600479bb853fc573de68e07.pdf?index=trueIn PDF document text
    • https://5071cc05-3fa2-46b1-b944-d2523ca4b51d.filesusr.com/ugd/62e2c1_2438c9c8ccfc412f807c5206ea41b34d.pdf?index=trueIn PDF document text
    • https://46ebecaa-9490-439b-bba6-ee77f1a6ca93.filesusr.com/ugd/cee8a1_1112412b62bf4a848fd95a398e6a7df4.pdf?index=trueIn PDF document text
    • https://a84030a7-2e48-4039-807a-383e2b7216cc.filesusr.com/ugd/c5d40f_8362f68d17e4470ca758d8077f64d2b7.pdf?index=trueIn PDF document text
    • https://1cbf0fd9-62af-4102-a3dc-982f361539e7.filesusr.com/ugd/bfbc46_e94d5064fe92498fae9c4caab6192f64.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gaxuremewuger/woredimidexugogenakirodu.pdfIn PDF document text
    • http://bizemilibudog.rf.gd/much_ado_about_nothing_cast_of_characters.pdfIn PDF document text
    • https://77bc4ea4-de20-41c0-a463-a5315db628d9.filesusr.com/ugd/2c69e3_61885618df944f47b424523372f9bc4c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bejokazemur/48923194970.pdfIn PDF document text
    • https://9c12218e-e157-4070-b33f-4467b3cb42bb.filesusr.com/ugd/0c60a0_1d00e0347b4445ddae8e0879c6908bc7.pdf?index=trueIn PDF document text
    • http://laxaguwen.epizy.com/5754115145.pdfIn PDF document text
    • https://025b4bf0-2906-4f5f-8a0f-6d4b68fc9518.filesusr.com/ugd/148ee2_127b3cf4524b4b2d8f57b76dbafbbe21.pdf?index=trueIn PDF document text
    • http://rufofexejojar.epizy.com/neem_oil_as_mosquito_repellent.pdfIn PDF document text
    • http://nakosaf.rf.gd/what_is_sugar_on_nutrition_label.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_off0000d1cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1CB 5648 bytes
SHA-256: 01d2079a6a728db32167bc06c1e15440986e4813ef23c7f6cca9817ffab05fd1
font_01_sfnt_off0000e510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE510 9976 bytes
SHA-256: 69438441ae32c1af219b9a94460820bd17388134aef2379c2c0484a36e1d5850