Malicious PDF — malware analysis report

Static analysis result for SHA-256 c99168973f191729…

MALICIOUS

PDF

78.1 KB Created: 2021-03-09 20:43:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: dc8a0351ac26d5f4b702543d28301df8 SHA-1: 9ad447c65f86accf0702f3c781045192d3c1e66c SHA-256: c99168973f191729d3ac8f882c28fca4db8c0291c0755391835d759b3839b836
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous embedded URLs pointing to disposable hosting, indicating a link farm designed to redirect users. The primary URL identified is https://lozipotod.ru/wix?keyword=introduction+to+chemistry+section+1.1+a+story+of+two+substances+answers, which is likely part of a phishing or malware distribution scheme.

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://lozipotod.ru/wix?keyword=introduction+to+chemistry+section+1.1+a+story+of+two+substances+answers PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4452157/normal_5ff8ede3b78a5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445864/normal_5ffacca1440e5.pdfIn PDF document text
    • http://sebaxupakokak.22web.org/chuyn_t_file_nh_sang.pdfIn PDF document text
    • https://cdn.sqhk.co/xekejegixawo/2hdhbSj/wigixogewewinezuxab.pdfIn PDF document text
    • http://frontglass.xyz/apdi_pode_mp3_songy8wul.pdfIn PDF document text
    • http://handler-autoscout24.com/terexokonuxozetisemikaditi0py5.pdfIn PDF document text
    • https://cdn.sqhk.co/suwajipufo/hzBlzRj/kolokusokula.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386618/normal_603c108fe611d.pdfIn PDF document text
    • http://intekzafast.online/rapawebiremuwuwojutusxariz.pdfIn PDF document text
    • http://priz24.site/8_grade_vocabulary_words_and_definitionsdn27j.pdfIn PDF document text
    • http://sokfresh.fun/sonuxizadopizatiperupahb04m.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
    • http://xuwolerapole.epizy.com/9760840003.pdfIn PDF document text
    • http://dofarofiberik.rf.gd/alkane_reactions_worksheet_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d3c9f8b-b129-4589-b11f-2d5643e5dd1c/ikea_leirvik_double_bed_frame_instructions.pdfIn PDF document text
    • http://labeberop.epizy.com/how_to_use_snow_whitening_system.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cafa2a3-aa40-4903-965c-b2803bee281e/problemas_resueltos_de_normalidad_quimica.pdfIn PDF document text
    • http://juwebud.epizy.com/modified_semi_block_business_letter_format.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/724785dc-b154-4757-a2c1-c948cad5c2ae/fagede.pdfIn PDF document text
    • http://lebozid.epizy.com/71006935691.pdfIn PDF document text
    • http://tofezininas.rf.gd/92953251389.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31424f66-37ea-44c5-8ae0-077c5ea99fbc/3664368507.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_off0000e4ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AE 5468 bytes
SHA-256: 55df2991d575217099c662aee82760a4b9a4b2582da4ac730566afd606956bef
font_01_sfnt_off0000f730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF730 10960 bytes
SHA-256: e2f84d117b56761bfed8d69b8a8a5fd88ecc8d8656f0211188d08405b58ffdb9
font_02_sfnt_off00011baa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BAA 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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