Malicious PDF — malware analysis report

Static analysis result for SHA-256 b779ac8751f93140…

MALICIOUS

PDF

70.8 KB Created: 2021-05-06 01:41:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 85e3b24a1b8208e690c6b3455609afb9 SHA-1: 5da644b686e2eb43dd7d1ce93cb57275ba6f9211 SHA-256: b779ac8751f9314092f1c8ae58e40de7309a226f1edc305aea0fd93e3398e203
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by both ML classification and ClamAV, specifically as a phishing trojan. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing campaign. The embedded URLs, such as 'https://xajibur.ru/strik?utm_term=stock+market+open+today+veterans+day', are likely used to redirect users to malicious sites or phishing pages. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://xajibur.ru/strik?utm_term=stock+market+open+today+veterans+day PDF link annotation
    • https://boretenewur.weebly.com/uploads/1/3/1/4/131453221/rezorule.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484359/normal_6009e5a9a9692.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408190/normal_600287b00c826.pdfIn PDF document text
    • https://jesidovelagira.weebly.com/uploads/1/3/4/7/134705211/xifudir-pekugefikez-juwofekarozegi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489848/normal_600097fecc574.pdfIn PDF document text
    • https://renixopofofof.weebly.com/uploads/1/3/4/4/134486295/wifapivorerelu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404313/normal_60400896ee4f7.pdfIn PDF document text
    • https://bisofojud.weebly.com/uploads/1/3/1/6/131607445/a60422275fb51.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/0de1bc16-0b63-4655-9907-acdc41a8d1ab/dnd_5e_best_campaigns_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95142a5a-2ed3-4672-b0d9-8a5eb57c7628/fawanogixitu.pdfIn PDF document text
    • https://s3.amazonaws.com/piradi/app_not_showing_up_on_android_emulator.pdfIn PDF document text
    • https://73e25548-3913-4bbb-aa69-a1b25f69568d.filesusr.com/ugd/cece23_6bf03ab90506474d842259b3266d8c26.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/74605c96-51c5-4781-a09f-cc3bcb9da8d7/what_are_the_formulas_for_special_right_triangles.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f1f7179-8d1a-4ae9-90bf-767e8650e336/sun_joe_electric_pressure_washer_not_starting.pdfIn PDF document text
    • https://s3.amazonaws.com/dowadotiju/avr_studio_4_full_version_free.pdfIn PDF document text
    • https://ab25a8b3-4d80-4d4b-93a1-c1347014fa7c.filesusr.com/ugd/8d0191_c69f56ec33164d75a758c78f6653a445.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ab8983c-9b6e-4cbd-b00f-86245efd0acf/purupejerosejug.pdfIn PDF document text
    • https://s3.amazonaws.com/janodojivi/resumen_de_100_aos_de_soledad_de_gabriel_garcia_marquez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e5869ed-7b0f-4215-881f-b86d9b9523ca/what_is_the_weather_for_dc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f5fb6b3-142d-4374-97d4-ff261540ce11/lokoxubad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94c7cf5e-eb92-452a-96c5-a58bbcb8e8bc/22786087162.pdfIn PDF document text
    • https://8b5ac0f3-2bc4-49a6-9a99-2541af31b215.filesusr.com/ugd/f2ef67_d1c1d39c5aef4932bba0d3620eb819f4.pdf?index=trueIn PDF document text
    • https://ded05c8b-f0d8-42bc-a64b-daa0b63394ca.filesusr.com/ugd/99afdc_8ee7adb4eed247bea850580a460e754a.pdf?index=trueIn 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_off0000d839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD839 5516 bytes
SHA-256: 4c86dbdaef5cf6cae5969d8753fe2eefb13123ba99e610fe21c53e64e429cae4
font_01_sfnt_off0000eaf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF6 10300 bytes
SHA-256: cc0f3f10d85f468d2f3e99102a1c4af69873f8b26df9bff1a5fb4059480dff9f

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