Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a57af318056cd89…

MALICIOUS

PDF

75.9 KB Created: 2021-04-30 03:32:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: cd6bc3f2e3cdf5c9853b2565da2732d2 SHA-1: f74f64b92b9d493ba505ee9c9a08f1cd6bd89963 SHA-256: 5a57af318056cd89a30de1ba51838704ca3467f25e79f8477f8b9afd2e308dc3
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious content. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and the 'link farm' heuristic strongly suggest a phishing or redirection attack, likely delivered as a spearphishing attachment.

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/strik?utm_term=dometic+fantastic+vent+3350+mit+wei%25C3%259Fer+kuppel PDF link annotation
    • https://cdn.sqhk.co/moxibusas/jchgAid/weezer_say_it_ain_t_so_year.pdfIn PDF document text
    • http://winoorama.website/tewiz4lp0z.pdfIn PDF document text
    • https://cdn.sqhk.co/jigugabopu/hAbvJhi/magiwisawaxeb.pdfIn PDF document text
    • http://nonretloli.site/tunixetosamelunamufekojohdpnf.pdfIn PDF document text
    • http://loveantravel.xyz/720489529723idad.pdfIn PDF document text
    • http://avit0.cc/69082182159potx6.pdfIn PDF document text
    • http://copyright-rules-help.com/what_does_unity_in_art_meanbxxkr.pdfIn PDF document text
    • http://momipusodutiga.22web.org/binovosonubujumosawepas.pdfIn PDF document text
    • http://soponakox.22web.org/cardio_workout_plan_for_weight_loss.pdfIn PDF document text
    • https://cdn.sqhk.co/furugilenu/CjbYkij/nisaj.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/e7aed4f4-8d42-4ca2-bbb9-5e483be0a67d/how_long_does_dewalt_20v_battery_last.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3e39af8-3106-4819-9542-d6e36532e7ff/42867122071.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5687419-c426-40b4-afda-fe6d481d5309/spectra_s1_plus_breast_pump_canada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81f4170d-5c43-4055-8167-84b409c21663/9066851411.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b64cb1a-1509-4983-82b0-c817c64a030c/ludafodevudakumida.pdfIn PDF document text
    • http://tureverikatefe.epizy.com/80624411762.pdfIn PDF document text
    • https://s3.amazonaws.com/wegugus/fixed_asset_investment_balance_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/silubebebefuju/christmas_festival_clarinet_sheet_music.pdfIn PDF document text
    • http://kaxegukepoxar.rf.gd/gazuwawevod.pdfIn PDF document text
    • http://julepudelixi.rf.gd/human_body_parts_exercises.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_off0000e412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE412 6008 bytes
SHA-256: bf6f636ebd628871e31ba337ded3c483539c1a92086e97d57a2246310451b0be
font_01_sfnt_off0000f88d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88D 11872 bytes
SHA-256: 1dad4f7b1d771e6f987495e8dcc4d4a7837bc03bbbeeb07e835ab6390768b435

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