Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0b6d087b2471fba…

MALICIOUS

PDF

85.4 KB Created: 2021-02-18 04:55:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 6fde51e2c1867ae699d6a76b59b243e2 SHA-1: d3129868736edf0d674016032ca174cf253e6c34 SHA-256: a0b6d087b2471fbab1048db267f6fc6ee2bbaae9f95fcf01c273e9e4396db98a
126 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to disposable domains and link farms, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates a non-clustered link farm on disposable hosting, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/strik?utm_term=hotels+cannery+row+monterey+bay+ca PDF link annotation
    • https://cdn.sqhk.co/wusezofetib/Iiipxib/nuweloxawulikotejanam.pdfIn PDF document text
    • https://cdn.sqhk.co/kominepoli/Vwvhb4A/you_are_my_starship_norman_connors_lyrics.pdfIn PDF document text
    • https://cdn.sqhk.co/xataruzepape/ehhXjdH/business_strategy_definition_mckinsey.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388424/normal_5fd795c34fa6d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474475/normal_5ffd641ca3574.pdfIn PDF document text
    • https://cdn.sqhk.co/samanugutu/ZjeUT5e/word_scramble_decoder.pdfIn PDF document text
    • https://cdn.sqhk.co/benibavagoge/idgdBii/dinudajopizufijafobuwagon.pdfIn PDF document text
    • https://cdn.sqhk.co/rilowikapaz/2Oupurq/chess_board_setup_pieces.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478667/normal_5fff773a1b723.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392195/normal_5fe707b6efe69.pdfIn PDF document text
    • https://cdn.sqhk.co/temirikuji/hf5fDfm/toca_boca_hair_salon_3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://veramok.rf.gd/common_quarterly_examination_september_2019_answer_key.pdfIn PDF document text
    • http://fukatotapi.epizy.com/esia_screening_report.pdfIn PDF document text
    • http://woloripovopakop.rf.gd/arunachalam_movie_video_songs.pdfIn PDF document text
    • http://ligumawi.epizy.com/bojemunoxeki.pdfIn PDF document text
    • https://s3.amazonaws.com/feliso/eso_depths_of_malatar_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/gajabedafot/24724877242.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001104f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1104F 5240 bytes
SHA-256: a4cb6129e67322adaa5bd0914e9cfbe857b7e78ae0d5d82654dbd4fe204048b2
font_01_sfnt_off00012223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12223 11976 bytes
SHA-256: ce95282aac1236bbd354e93fee18d32356658b55e3d5ce3c4828862c90da44bf

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