Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e85fc338b61af09…

MALICIOUS

PDF

75.1 KB Created: 2021-03-03 04:05:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 9cf78ce5010c7a561dca4e3b3a0f273a SHA-1: cadbdd4c49a5a7befe076a589159dc78493c3808 SHA-256: 5e85fc338b61af093c17be215fe1a5e0139ee3ef58aa437835aaad0a9155db7e
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The document body, though heavily obfuscated, contains a search query related to salaries, suggesting a lure to trick users into clicking embedded links. The presence of numerous external URIs, including a link farm on disposable hosting, further supports a malicious intent, likely to redirect users to phishing sites or download further malware.

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://xezojetit.ru/strik?utm_term=how+much+is+nigerian+navy+salary+per+month PDF link annotation
    • https://zepitobazelaki.weebly.com/uploads/1/3/4/6/134619491/fuditofedazu_nuvasimugiguno_xadomena_fufageko.pdfIn PDF document text
    • http://septiki-rf.website/number_theory_textbook0wgvt.pdfIn PDF document text
    • http://zikizitepef.iblogger.org/video_converter_pro_1._9_apk.pdfIn PDF document text
    • http://loveantravel.xyz/6018479583owb3j.pdfIn PDF document text
    • http://eeuuurrrrr.space/pronunciation_guide_latin_plant_namesepb50.pdfIn PDF document text
    • https://foluxafan.weebly.com/uploads/1/3/5/3/135397430/624362.pdfIn PDF document text
    • https://zujomesesewega.weebly.com/uploads/1/3/4/9/134902804/7701001.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vurisadazuxe.epizy.com/famudirakebukob.pdfIn PDF document text
    • http://giduzorim.epizy.com/62854654694.pdfIn PDF document text
    • http://waxozex.epizy.com/nts_dm_answer_key_15_september_2019.pdfIn PDF document text
    • http://delenujafoxa.rf.gd/humana_vitality_biometric_screening_form.pdfIn PDF document text
    • https://s3.amazonaws.com/novipaliwid/35489931048.pdfIn PDF document text
    • http://posamesesul.epizy.com/52270643515.pdfIn PDF document text
    • http://mijewuwusos.epizy.com/92974367436.pdfIn PDF document text
    • http://gojetovumivet.epizy.com/29561127077.pdfIn PDF document text
    • https://s3.amazonaws.com/lovetijif/jidekuvuxefux.pdfIn PDF document text
    • https://s3.amazonaws.com/zesotat/72187154202.pdfIn PDF document text
    • https://s3.amazonaws.com/vuterijoze/kuttywap_1080p_hd_video_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/bawalidamovidud/wopuput.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_off0000e501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE501 5564 bytes
SHA-256: 972be442a0a068cbe5aa1fdab5380ac9ad199ed9a1d0dab5d2e58f58634cfb82
font_01_sfnt_off0000f7e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E1 11552 bytes
SHA-256: 240adc196d724962481a15363dc962ddadbfa52fe94e5f93326a6e0a42badeb2

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