Malicious PDF — malware analysis report

Static analysis result for SHA-256 343a0ace85f21126…

MALICIOUS

PDF

83.5 KB Created: 2021-05-14 14:28:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb97cc6489c2d636b0c5d90b371c2681 SHA-1: 2333449c2d3abcec47345ad04d299650c8b24d2a SHA-256: 343a0ace85f2112639ad0bc46089025aecc4841bd37e3744a10d8902f8587f83
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 are disguised as legitimate documents, indicating a link farm or phishing attempt. The primary malicious URL identified is 'https://jacksth.ru/strik?utm_term=when+does+ahsoka+come+back+in+rebels', which is likely used to redirect users to a malicious site. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/strik?utm_term=when+does+ahsoka+come+back+in+rebels
    • https://rukeruxesam.weebly.com/uploads/1/3/4/7/134700508/4354179.pdf
    • https://cdn-cms.f-static.net/uploads/4479917/normal_6065f7ebd852b.pdf
    • http://todayit.pro/potential_and_kinetic_energy_worksheets_answers14sg5.pdf
    • http://lojasamericanasbr.com/game_ludo_game_karol4f4x.pdf
    • https://cdn-cms.f-static.net/uploads/4485322/normal_6061ecf12d6cd.pdf
    • https://salexutoxor.weebly.com/uploads/1/3/4/7/134761189/f7777087cb.pdf
    • http://astropsychology.site/skyrim_special_edition_crashes_on_ne1yid1.pdf
    • http://electorat.org/residence_inn_chicago_lasallefb1sm.pdf
    • https://resodarapasak.weebly.com/uploads/1/3/4/6/134659305/e0c67.pdf
    • http://arfesopt.com/livro_raizes_do_brasilt2n4u.pdf
    • https://kidiveguworuriw.weebly.com/uploads/1/3/4/6/134677920/7a7ce84ce80.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://d4078116-a2d5-466f-97e6-20d899f6ca30.filesusr.com/ugd/576447_0025eea316cb477a927d170d8103dded.pdf?index=true
    • https://uploads.strikinglycdn.com/files/3924b412-c28a-4904-b02e-b4bf5df98b51/holy_quran_english_translation_book.pdf
    • https://uploads.strikinglycdn.com/files/87c3ecad-d76d-4bef-8528-f1fe63377144/who_has_the_strongest_crew_in_one_piece.pdf
    • https://uploads.strikinglycdn.com/files/1184f3b8-4d90-4ac3-a3e1-3b0d4a5405c3/why_is_my_netgear_nighthawk_not_working.pdf
    • https://c0cead0d-5248-483d-940e-95cc3acd9bde.filesusr.com/ugd/20d83a_dde818e86bf84478a0614bfc74df84c9.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc6c.bin
5963eb8989f14b53121e2438047ce0159b8e09c059d629440fa84d21bd5ff409		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6C 5104 bytes
font_01_sfnt_off00010d8d.bin
cba9c70353ccaef56def239a9e326f94ed644b921109d13e4764efee0fb8b443		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8D 10872 bytes
font_02_sfnt_off00013299.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13299 4324 bytes

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