Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c6cf1c22efa2e94…

MALICIOUS

PDF

76.1 KB Created: 2021-04-20 23:11:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: b6026ef85c0896bcbece5772ca3b187d SHA-1: 09ee1d2ce44d59da955c1a25bbbebc382f06a346 SHA-256: 1c6cf1c22efa2e94a8e2a72e4b55251a29e4ff88bcd2c54aa38adbc3279b1df1
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable domains and redirector infrastructure, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious redirection, potentially leading to further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • 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://crophysi.ru/strik?utm_term=how+old+to+work+at+ross In PDF document text
    • https://cdn.sqhk.co/virapazetif/Fgj5jfF/cosmoprof_las_vegas_locations.pdfIn PDF document text
    • https://cdn.sqhk.co/vemetafije/fWsgXQw/kawenobi.pdfIn PDF document text
    • http://starkrobotics.org/468016144762a96y.pdfIn PDF document text
    • https://cdn.sqhk.co/votojuxosaf/getshjP/square_top_jumpsuit.pdfIn PDF document text
    • http://giwosoto.sportsontheweb.net/educational_research_quantitative_qualitative_and_mixed_approaches_3rd_edition.pdfIn PDF document text
    • https://wulapoledonuker.weebly.com/uploads/1/3/2/6/132695240/dekakoloberudon-nujesozobi-lasafotubemetot.pdfIn PDF document text
    • http://pet-guru.shop/tomb_runner_2_unblockeds282z.pdfIn PDF document text
    • https://bewepuxajijasi.weebly.com/uploads/1/3/4/3/134362307/2630179.pdfIn PDF document text
    • https://cdn.sqhk.co/fudimesa/ijhjAiK/pico_tanks_multiplayer_mayhem_apk.pdfIn PDF document text
    • https://muxetomanudone.weebly.com/uploads/1/3/1/4/131406273/pukaberotepuza.pdfIn PDF document text
    • http://bewizasosu.sportsontheweb.net/cours_d_anglais_et_francais.pdfIn PDF document text
    • http://wgathering.org/how_to_calculate_acceleration_due_to_gravity_using_simple_pendulumbtb9o.pdfIn PDF document text
    • https://cdn.sqhk.co/bubiwalifeda/farughg/247_blinds_discount_code_10.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/midizaxopazeji/48003650637.pdfIn PDF document text
    • https://s3.amazonaws.com/kovilowab/pro_forma_financial_statement_template_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/vokeri/chandrakanta_episode_11.pdfIn PDF document text
    • https://s3.amazonaws.com/mafavuzenoliki/99552470649.pdfIn PDF document text
    • http://kakasis.onlinewebshop.net/79968201279.pdfIn PDF document text
    • http://juwukopegonamu.onlinewebshop.net/bosquejos_biblicos_evangelicos.pdfIn PDF document text
    • https://s3.amazonaws.com/mixanaz/pillars_of_the_earth_tv_series.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_off0000ebef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEF 4936 bytes
SHA-256: 2c59903c26ef3931bd94c6c534b49eea279a113ed6a39b47d6ac4bd0e619e259
font_01_sfnt_off0000fcd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD3 11168 bytes
SHA-256: 436ecfdf7d91792633535bdfdba7a4a2a81e747cbd0a58d2f97d38e036bec740