Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f346508e8f34dd2…

MALICIOUS

PDF

71.2 KB Created: 2021-02-13 17:55:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: d2f87967c354f5d6aacaeac14cd335ab SHA-1: 268417762d30ab5e43a30deb40e1979cc1d4156e SHA-256: 0f346508e8f34dd2ae0475128fc62210d2bd1c598f22b7e6c7e9ee4099aca016
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with at least one pointing to a link farm designed for SEO manipulation, suggesting a phishing or malware distribution lure. The presence of PDF_URI and EMBEDDED_URL heuristics further supports the conclusion that the document is designed to redirect users to external, potentially harmful, websites.

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://jottigo.ru/wb?keyword=logical%20reasoning%20questions%20and%20answers%20for%20quiz PDF link annotation
    • https://cdn.sqhk.co/dubikewe/vDiaThe/25379245059.pdfIn PDF document text
    • http://kepovimobezozo.iblogger.org/note_taking_worksheet_invertebrate_animals_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/dedatemaran/hn8hiM0/drill_evolved_hack_download_ios.pdfIn PDF document text
    • https://cdn.sqhk.co/vifutetax/3aO1uji/vitijo.pdfIn PDF document text
    • http://tumerasiwabuzip.22web.org/infographic_design_templates.pdfIn PDF document text
    • https://cdn.sqhk.co/xexegapimuwi/HjiaNii/the_weather_channel_atlanta_address.pdfIn PDF document text
    • https://cdn.sqhk.co/dijogiper/c8fHgh4/swipe_brick_breaker_the_blast_level_324.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476001/normal_601297e00220d.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxovunevo/CQhbpfH/wwe_finishing_moves_2019.pdfIn PDF document text
    • http://ighelperscenter.com/sap_lsmw_stepsr6eu7.pdfIn PDF document text
    • https://cdn.sqhk.co/vabedesi/Nic4has/crazy_racing_car_2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bapaxezeb.epizy.com/marshmallow_toothpick_challenge_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/xijalovelokolep/whatsapp_status_bayan_tamil.pdfIn PDF document text
    • https://s3.amazonaws.com/gewisetug/dikezojipupevarizo.pdfIn PDF document text
    • http://novosumagib.epizy.com/longman_dictionary_of_contemporary_english.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_off0000d86c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD86C 5396 bytes
SHA-256: bb3598359c39f8576581848fcdca0c3bb46c739da7e3e5fce75a7e57d46c5279
font_01_sfnt_off0000eaef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEF 10884 bytes
SHA-256: 2dc15891756b53093d2909ca6453c5b7e871fda4301a851f4185018c9420ac0c

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