Malicious PDF — malware analysis report

Static analysis result for SHA-256 084b5e7c6cf08ba4…

MALICIOUS

PDF

80.5 KB Created: 2021-04-05 22:50:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eebc74719c1c9de9cca4ad041c27e41d SHA-1: 9a2d97c9aed9dfa820f35bee6d0ee4ac7ec9f439 SHA-256: 084b5e7c6cf08ba4b17bfead6bbd1e1980a4a7b94c3bd9a0e39bfcdfff2aae4e
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 hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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 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://jacksth.ru/award?keyword=phantom+of+the+opera+script+andrew+lloyd+webber+pdf
    • http://ruwaxidalemib.iblogger.org/natural_log_derivative_worksheet.pdf
    • https://cdn.sqhk.co/sizafutito/6gihahc/bezolepodogokaka.pdf
    • https://cdn-cms.f-static.net/uploads/4408701/normal_5fe8ff66678c0.pdf
    • https://cdn.sqhk.co/vixonafom/cgjiigg/burnout_masters_money_glitch.pdf
    • https://nililekekikare.weebly.com/uploads/1/3/0/7/130739967/newakavuga_mesagizorulet_tikanuxolisa.pdf
    • https://bemebedutor.weebly.com/uploads/1/3/4/6/134624352/vipegakek-lavefub-vozezot-sozavi.pdf
    • https://cdn-cms.f-static.net/uploads/4421640/normal_606116665b2d6.pdf
    • https://pudorexejuvaw.weebly.com/uploads/1/3/1/4/131455832/08a9180.pdf
    • https://cdn.sqhk.co/notenirikev/ijjtIhg/indications_for_cesarean_section_guidelines.pdf
    • https://cdn.sqhk.co/zaborofisi/hdhf841/tewidibeposivarapejame.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://rumavajusugeg.rf.gd/bukhari_hadees_sharif.pdf
    • http://kubobizezaf.epizy.com/20852256546.pdf
    • https://f2d828cf-06d9-46ea-85af-d88b0bc20d44.filesusr.com/ugd/501a20_2d31cd2223ca443887046b2857e84e23.pdf?index=true
    • https://f06ae689-34e6-4fd9-b749-a5985747e370.filesusr.com/ugd/4117a9_9812605bd14f44e78a88ad94fdb539ea.pdf?index=true
    • https://uploads.strikinglycdn.com/files/1af7b2d7-b7f8-4b3e-9a5e-2588ac24a4a2/36736172522.pdf
    • https://8acf0fc4-2da8-4686-9788-d7840b5449fc.filesusr.com/ugd/fab691_1f77be64fb44485eaecaa2174caba694.pdf?index=true
    • https://uploads.strikinglycdn.com/files/167f3933-c7b1-4b15-af50-32ae324131f5/jbl_eon_615_bluetooth_pairing_code.pdf
    • http://sitolomuku.epizy.com/rorejodaz.pdf
    • https://uploads.strikinglycdn.com/files/03578afb-01cb-41b4-a02a-ca4714a1e3df/kudagazubavelipuroxera.pdf
    • https://f608bf75-187c-4b28-9621-af925c05c2b6.filesusr.com/ugd/05e3ad_31478fe589364f27bec4408ca13c5e1b.pdf?index=true
    • https://d86ad34a-7df2-4f47-937b-a12ab5abc0fa.filesusr.com/ugd/8cbfce_916805bb10584cdba4cc8a85db303730.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbdf.bin
07cd04b52252486e64c152b41e74d1e69ba5db3ec1d88163095d41a4060a47d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDF 5728 bytes
font_01_sfnt_off00010f4c.bin
033940c54a1ae44174b330edc1747cf55a04f19515cd39e26bdbe82474995006		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F4C 11040 bytes

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