Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3f7a1c83a162dd8…

MALICIOUS

PDF

73.5 KB Created: 2021-03-14 21:45:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: b68cc6f2f8f2b05798adda433af157a5 SHA-1: 62b0bcf35e28c331e4626e63a5efc221012fe308 SHA-256: d3f7a1c83a162dd888b8f2d8f2db5530fbd4774ced9eb82bfd9b569c87785477
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with a significant portion pointing to disposable domains and a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through SEO manipulation. The presence of external URIs and a link farm heuristic suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/wix?keyword=hindi+worksheets+for+kids PDF link annotation
    • http://freehookup.xyz/zipejorsd4g2.pdfIn PDF document text
    • http://eurosett.net/antrenmanlarla_matematik_2_zmcdy5r.pdfIn PDF document text
    • http://lngcliente.com/mafawupojotiva6serj.pdfIn PDF document text
    • http://voirly.xyz/18955229583dqhtc.pdfIn PDF document text
    • http://curvepreloved.com/kiziwovula35bpv.pdfIn PDF document text
    • http://gratoraama.website/disuniwon21d.pdfIn PDF document text
    • http://znakomstva69.space/sapibawatibutofuvujodo7ssfz.pdfIn PDF document text
    • http://jewogipuwivi.medianewsonline.com/91386023930.pdfIn PDF document text
    • http://arthromedro.xyz/jojokapepomts9m6.pdfIn PDF document text
    • http://rimarilomikozu.medianewsonline.com/37106909607.pdfIn PDF document text
    • http://bewilotaweje.mywebcommunity.org/jemogidalevepi.pdfIn PDF document text
    • http://cosmeteca.com/1mg_etizolam_trip_report600ne.pdfIn PDF document text
    • http://digtalcaliper09.xyz/421418594790zzt1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/96554526-696d-4a97-aa05-5cb85c7e8120/nixawaduzujesemimi.pdfIn PDF document text
    • https://s3.amazonaws.com/zerejibixupav/23683975475.pdfIn PDF document text
    • https://s3.amazonaws.com/gafedupeba/construction_cost_control_excel_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/lebaxa/11810465418.pdfIn PDF document text
    • https://s3.amazonaws.com/xifabilejilab/taxagiwokamadokijofi.pdfIn PDF document text
    • https://s3.amazonaws.com/mufukep/christian_movies_mp4_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea181a1e-3fdb-475d-9619-fd49e36dc857/where_can_i_drop_off_goodwill_donations_during_coronavirus.pdfIn PDF document text
    • http://pusapovewazigu.onlinewebshop.net/mackie_cfx12_mkii_price.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_off0000e4dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DD 4868 bytes
SHA-256: d04f0f1ed7f2138e1546031a8811d4e8d3019c936390041db553b6ac02a70ac6
font_01_sfnt_off0000f57a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57A 10360 bytes
SHA-256: 77040a5dacddcfeb8add5cfacbc91ea0d5dfd8e607103a8d59c0023e81e6db5b

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