Malicious PDF — malware analysis report

Static analysis result for SHA-256 26c9336fa7cf6467…

MALICIOUS

PDF

72.6 KB Created: 2021-02-27 12:51:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 9af7eb43e3adc2311c1dae0b6f895700 SHA-1: a443b1b8399bcdec66945ad17f490a5222a5dd51 SHA-256: 26c9336fa7cf6467e50b39536da5f63f2df09dca30f460bf5ff034ba8f5898d1
126 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains and link farms, suggesting an attempt to redirect users to malicious content or phishing sites. The document body, though heavily obfuscated, contains references to search terms, further indicating a lure for users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://gimoguvi.ru/strik?utm_term=how+much+is+55+inch+samsung+tv PDF link annotation
    • https://cdn.sqhk.co/woxiwovar/ghjihdp/ark_survival_evolved_crossplay_servers.pdfIn PDF document text
    • https://xumizobizuzu.weebly.com/uploads/1/3/4/6/134688834/xetepubogikuxa-pavitibewivo.pdfIn PDF document text
    • http://fito4ka.xyz/what_is_an_introductory_prepositional_phrase_examples5pe38.pdfIn PDF document text
    • http://papotanepif.22web.org/blocs_income_guidelines.pdfIn PDF document text
    • https://cdn.sqhk.co/migefareg/g7dxjgL/15694187395.pdfIn PDF document text
    • https://cdn.sqhk.co/bamazaludez/WgighZg/7801438720.pdfIn PDF document text
    • http://emirofficialzm.com/adfg_file_hunt_report5jtd9.pdfIn PDF document text
    • https://nulaxevaximuji.weebly.com/uploads/1/3/0/7/130776814/diluzowis.pdfIn PDF document text
    • http://farvestnn.ru/public_speaking_topics_persuasive7b5h1.pdfIn PDF document text
    • https://foreguguwikib.weebly.com/uploads/1/3/0/7/130775698/kazixurunixo.pdfIn PDF document text
    • https://cdn.sqhk.co/bixatavafut/ejgNge6/51344858474.pdfIn PDF document text
    • http://maxist.ru/nidisasokorefakuziwoliiptcm.pdfIn PDF document text
    • https://zipakodexosif.weebly.com/uploads/1/3/5/3/135344546/punanivadasapulub.pdfIn PDF document text
    • http://best-store.club/12751235741e7oem.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/waxegatulo/zasatupumufifirujol.pdfIn PDF document text
    • https://s3.amazonaws.com/gulapore/bojizerabobo.pdfIn PDF document text
    • https://s3.amazonaws.com/wudibirewuduto/vegewepu.pdfIn PDF document text
    • https://s3.amazonaws.com/gisujubolidine/47674126594.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_off0000de02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE02 5320 bytes
SHA-256: bb8249cdc5ca6825f12caa86ef3672b71bc2113233081ab27c372a91a177f783
font_01_sfnt_off0000f019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF019 11016 bytes
SHA-256: 548c2234c773d73ed0c045e1f99310f23278a8946f6671488c9691ad181adf32

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