Malicious PDF — malware analysis report

Static analysis result for SHA-256 3df0823808742b51…

MALICIOUS

PDF

71.4 KB Created: 2021-05-09 17:15:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 5f64e1ba25cd152d92d8716ae740075c SHA-1: 7d643115383c173f8a81fdcdf30577839f9176f2 SHA-256: 3df0823808742b51d38211407c518bbc3f37f46d619d21e0393fb8e1be1e19d4
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting services, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of embedded URLs and the overall structure point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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.
  • 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://midufefew.ru/strik?utm_term=diary+of+a+wimpy+kid+ebooks+free PDF link annotation
    • https://cdn.sqhk.co/posojuvapono/8eicAvA/lulaxufewabobaxosadojimo.pdfIn PDF document text
    • https://jadegivi.weebly.com/uploads/1/3/4/8/134851053/6906586.pdfIn PDF document text
    • https://cdn.sqhk.co/wujozuzewed/hjdHHij/amc_stock_projection.pdfIn PDF document text
    • https://cdn.sqhk.co/dedogupazib/NjgFPwy/electric_key_meter_readings_explained.pdfIn PDF document text
    • https://jumozavuna.weebly.com/uploads/1/3/4/5/134598597/kogewiro.pdfIn PDF document text
    • https://cdn.sqhk.co/balaragu/frCHyia/exogenous_ketones_walmart.pdfIn PDF document text
    • http://silevovuvejojev.iblogger.org/24059257067.pdfIn PDF document text
    • https://cdn.sqhk.co/zubuwebofe/hnO6hh8/xekapetulometegikabibux.pdfIn PDF document text
    • https://cdn.sqhk.co/baruduwege/hjjgDBz/playmobil_ghostbusters_firehouse_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/busibelifiv/dsNgcl7/32084599090.pdfIn PDF document text
    • https://cdn.sqhk.co/napumefu/MdxUWii/color_by_number_car_easy.pdfIn PDF document text
    • https://cdn.sqhk.co/danopefasuf/lsjjQzT/xusubexame.pdfIn PDF document text
    • http://tupedesixavero.iblogger.org/49557217896.pdfIn PDF document text
    • https://cdn.sqhk.co/pinofizulag/iilghJ1/move_the_box_level_21.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/vibasujefir/sesamafesumoragojosasez.pdfIn PDF document text
    • http://posazexemonepen.rf.gd/24020408078.pdfIn PDF document text
    • https://s3.amazonaws.com/tufitijinexu/vanity_fair_outlet_mens_wrangler_jeans.pdfIn PDF document text
    • https://s3.amazonaws.com/wuxupewu/juxenedu.pdfIn PDF document text
    • https://s3.amazonaws.com/jidagafinuxesu/angular_8_reactive_forms_radio_buttons.pdfIn PDF document text
    • https://s3.amazonaws.com/rogugagatuf/22820792344.pdfIn PDF document text
    • http://rulalovurodaf.epizy.com/lasko_22_inch_ceramic_tower_heater_walmart.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d80e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD80E 5552 bytes
SHA-256: 9ef6e219fda55e4bb044b08b2b9820a8877c1dc552b568abbcf518393deca7c9
font_01_sfnt_off0000eaf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF7 10940 bytes
SHA-256: 73bd0f88ff17d7b71d0a7f7d44a1404233e8eaa6ad50fe8df0305aaf6908d137

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