Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7c097497f82f5ed…

MALICIOUS

PDF

91.2 KB Created: 2021-04-01 14:04:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 79d8d12603c793e1e00f95fb4bc6c8ee SHA-1: dc669aefd85d7be40265996bef1fd8c375d50d5e SHA-256: c7c097497f82f5edff83a67069f750ef378aa7953c77df6d354ad447d484994d
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to SEO-optimized content, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URL 'https://jacksth.ru/wix?keyword=guide+block+inventor' is likely the primary malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 5

  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/wix?keyword=guide+block+inventor
    • http://rakadan.sportsontheweb.net/cisco_to_juniper_command_conversion_tool.pdf
    • http://pesisasije.22web.org/marathi_kadambari_list.pdf
    • https://valezofijamope.weebly.com/uploads/1/3/4/4/134445284/be44c.pdf
    • https://wefejakero.weebly.com/uploads/1/3/0/8/130814310/navobo_vukiruvagi.pdf
    • http://gesofetol.iblogger.org/holistic_nursing_approach.pdf
    • https://lewemesabis.weebly.com/uploads/1/3/4/7/134734043/zoreb.pdf
    • https://kolijegidixut.weebly.com/uploads/1/3/1/3/131379325/5045098.pdf
    • http://jepewadagamer.scienceontheweb.net/73584315543.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/gebukil/2nd_grade_math_worksheets_money_printable.pdf
    • https://uploads.strikinglycdn.com/files/785d6099-7f56-49c7-8faf-8451b27a286e/vefimelifawibaxojula.pdf
    • https://s3.amazonaws.com/fajujiju/free_movie_piano_sheet_music.pdf
    • https://uploads.strikinglycdn.com/files/f7879c1e-affd-4ea2-88ec-8e01f6f25886/76431230964.pdf
    • http://vejajideb.epizy.com/jipisoxifoviz.pdf
    • https://s3.amazonaws.com/paxunu/polycarbonate_roof_sheeting_brisbane.pdf
    • https://uploads.strikinglycdn.com/files/d68866ca-02af-4d50-9c51-71ee5be922a1/20179913809.pdf
    • https://s3.amazonaws.com/divexikav/dilazowososaw.pdf
    • https://uploads.strikinglycdn.com/files/c9838f50-1391-4978-b3ea-1b2eb5f7efe8/zosani.pdf
    • http://gazusoketa.epizy.com/1099982453.pdf
    • https://uploads.strikinglycdn.com/files/30c70ab1-b946-4b41-8672-588ba9fed3a9/how_to_test_gm_oil_pressure_sensor.pdf
    • https://uploads.strikinglycdn.com/files/8d4ff43a-a8db-473c-af9b-d24b984b8395/nuevo_testamento_interlineal_griego_espaol.pdf
    • http://sidepojedava.myartsonline.com/iupac_modern_periodic_table.pdf
    • http://gofirog.epizy.com/woxilarisawav.pdf
    • https://uploads.strikinglycdn.com/files/0890f112-867a-42c2-b7e5-1ae6ace45109/givuliwafevesun.pdf
    • https://s3.amazonaws.com/belopudevuzuza/galasatuwevudetefuxodus.pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011b4a.bin
f50e36e9cb4df228e06d849f65d578318fb8cbaa1caa536af4a3768a0152c40b
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B4A 4724 bytes
font_01_sfnt_off00012b5f.bin
72b5bb94dd5ef393812b829015eb9067daba0c626b49b9b80957c43f400628d8
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B5F 11284 bytes
font_02_sfnt_off00015151.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c
pdf-font-stream PDF embedded font (sfnt) at offset 0x15151 4324 bytes