Malicious PDF — malware analysis report

Static analysis result for SHA-256 239f1c6d0f3d8456…

MALICIOUS

PDF

73.7 KB Created: 2021-02-14 16:58:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 4f5c6858ee08110102b4e1a224d52ea3 SHA-1: a4225f80c0383ef25ff1a4e3654c824b1e089ddd SHA-256: 239f1c6d0f3d8456d126e4c22111f5f4f7105db13647c6c1af87279e33e79d94
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many hosted on disposable domains or link farms, indicating a likely SEO manipulation or phishing scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically classifying it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the use of embedded JavaScript for malicious redirection or content delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://seumenha.ru/wb?keyword=transformers%20autobots%203ds PDF link annotation
    • https://dolujutizividev.weebly.com/uploads/1/3/4/8/134864897/4599845.pdfIn PDF document text
    • https://cdn.sqhk.co/wavudasawete/f6geigE/22468823052.pdfIn PDF document text
    • https://dunokosira.weebly.com/uploads/1/3/5/3/135349308/7735009.pdfIn PDF document text
    • https://cdn.sqhk.co/rufadexu/hgx0HHl/30857297240.pdfIn PDF document text
    • https://cdn.sqhk.co/ribobujir/jeidCjc/dental_assistant_salary_2019_nyc.pdfIn PDF document text
    • http://govnososal.xyz/kambal_katinig_o_klaster_worksheetv8m3z.pdfIn PDF document text
    • https://duwujesipegon.weebly.com/uploads/1/3/4/8/134883919/tefobusogono.pdfIn PDF document text
    • http://prod-fruit.space/carmina_burana_scorebds0a.pdfIn PDF document text
    • https://kujunegisim.weebly.com/uploads/1/3/1/3/131380440/c30df35c756497.pdfIn PDF document text
    • https://cdn.sqhk.co/befozaxulot/thiBhdE/move_to_ios_transfer_interrupted.pdfIn PDF document text
    • https://cdn.sqhk.co/wazafanez/TAghhaO/bigidumu.pdfIn PDF document text
    • https://cdn.sqhk.co/losegiro/hb4yidl/zunepoxutes.pdfIn PDF document text
    • https://mipirizu.weebly.com/uploads/1/3/2/6/132682564/lizeb-pewexajejizogis.pdfIn PDF document text
    • https://cdn.sqhk.co/wanoposuj/6hbOgeb/idle_crafting_empire_mod_apk_android_1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/divelikubapiwaj/anime_streaming_apps_android_reddit.pdfIn PDF document text
    • https://s3.amazonaws.com/lorerexeg/29922042890.pdfIn PDF document text
    • https://s3.amazonaws.com/jajoxulabojaso/juxoxeromadijadasozosixa.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD615 5108 bytes
SHA-256: b65e0cc5b699de82c3531ce59987813b2d32477fe3cbcf3142141333375de155
font_01_sfnt_off0000e746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE746 10764 bytes
SHA-256: 2838ea04872d5e6d16d482468c7848e6ab950c8a253a07bfce256080a90ac898
font_02_sfnt_off00010be7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE7 4324 bytes
SHA-256: 8405bb6ca9a6fb718a2e910e1cdde4d74ac2122cab0061dc5f772322db9c7ccd

Open this report in the interactive analyzer, or submit your own file for analysis.