Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a66653694cc6c3a…

MALICIOUS

PDF

79.1 KB Created: 2021-04-19 06:08:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 4328af2291064becef468b0b780e5d42 SHA-1: 64a828040c0edde6a424aa0c29f40e50d0687206 SHA-256: 7a66653694cc6c3a14bb79b44dc5912bc6c603854bf5e334f90baf15e8cb5e1c
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many pointing to disposable hosting and acting as a link farm, strongly suggests a phishing or malware distribution campaign. The document body, though heavily obfuscated, contains metadata related to its creation, but no direct instructions or lures are discernible.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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/strik?utm_term=midnight+sister+souljah+audiobook PDF link annotation
    • https://veduwasa.weebly.com/uploads/1/3/1/6/131637496/pejoraguzizabufosule.pdfIn PDF document text
    • http://xejeboge.22web.org/definition_of_blue_ocean_strategy.pdfIn PDF document text
    • http://todivanazazedi.22web.org/jejinu.pdfIn PDF document text
    • http://kidalozexeneni.iblogger.org/body_code_healing_system.pdfIn PDF document text
    • https://totakolexab.weebly.com/uploads/1/3/5/3/135391630/gumapuza.pdfIn PDF document text
    • http://mosilosa.iblogger.org/remogegedom.pdfIn PDF document text
    • http://pogadai.xyz/asus_rt_ac66u_manual93bax.pdfIn PDF document text
    • http://sogikujuwawim.22web.org/kimavejemakolinule.pdfIn PDF document text
    • http://woodlesenka.ru/sujurideximamelopuljsp6x.pdfIn PDF document text
    • https://guxenebulofoto.weebly.com/uploads/1/3/2/8/132814975/nilunavutukira.pdfIn PDF document text
    • https://kakulekatorud.weebly.com/uploads/1/3/4/6/134681497/xojubawetexalu.pdfIn PDF document text
    • https://ruvatekokero.weebly.com/uploads/1/3/1/4/131437102/ximevuvuji-vorevuwufiw.pdfIn PDF document text
    • http://zuvewedapajazo.iblogger.org/heavy_equipment_rental_contract_template.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://uploads.strikinglycdn.com/files/6050a217-0b3b-4a45-b84e-edc343fc4897/tidofamejikozanizinexad.pdfIn PDF document text
    • http://wikeratofi.epizy.com/orpheus_and_eurydice_book.pdfIn PDF document text
    • http://wajutomagavugaz.epizy.com/55271412797.pdfIn PDF document text
    • http://muresapidun.epizy.com/4943524671.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18171c82-8242-4717-86b2-eb5085993fac/wake_up_wake_up_the_time_has_come_poem.pdfIn PDF document text
    • http://gonazanuta.epizy.com/overlord_light_novel_volume_14_chapter_4_part_12.pdfIn PDF document text
    • http://zasotozipob.rf.gd/31522808756.pdfIn PDF document text
    • http://xofiketur.rf.gd/facebook_video_er_for_pc_windows.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_off0000e787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE787 5252 bytes
SHA-256: a3fefc37784db94cc5e5a6ff7a558d1231afc7695af8905302db87d336df66a0
font_01_sfnt_off0000f95d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95D 11932 bytes
SHA-256: d8aee9924ebd1eb819fb921eb9989fbc5a84e3a78a7b33e64fd876722fb040be
font_02_sfnt_off000120b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B5 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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