Malicious PDF — malware analysis report

Static analysis result for SHA-256 5273fd77b368a1de…

MALICIOUS

PDF

79.3 KB Created: 2021-03-14 15:12:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 4587eb32c5c790179ce41c9e8fda5d27 SHA-1: bdc3a7f07726c73352dff1b03ec9825e63808544 SHA-256: 5273fd77b368a1dee8e2775e12e5f85a74daa018ad6208ee091928aa849cdce5
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including ClamAV detection and an ML classifier. It contains a large number of external links, many of which are on disposable hosting, suggesting a link farm designed to redirect users. One prominent URL is `https://baarspo.ru/strik?utm_term=2wire+gateway+2701hg+b+manual+pdf`, which is likely part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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://baarspo.ru/strik?utm_term=2wire+gateway+2701hg+b+manual+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4471082/normal_5fd2d3a09d91a.pdfIn PDF document text
    • http://helplnstagramoffice.com/665767486219sfdz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425908/normal_5fdc3b93bcb3e.pdfIn PDF document text
    • http://astropsychology.site/stanley_wet-dry_vac_6-gallon_4.0_peak_hp_manualfywqa.pdfIn PDF document text
    • http://gabasikekapubul.iblogger.org/abiotic_and_biotic_factors_worksheets.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464541/normal_6045f9de9f8e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365580/normal_602bf68cd122e.pdfIn PDF document text
    • http://excellent-spb.ru/clauses_of_result5bu27.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://307a23dc-bb60-4906-9a68-69e45957aa19.filesusr.com/ugd/d2057d_02b64aa041294ea78e0982a8d353e408.pdf?index=trueIn PDF document text
    • https://c8d0f166-86fd-441b-8df5-aa5e6c6c7644.filesusr.com/ugd/f4b3af_a8db5de4c9ac45fca1ab31c97cacb729.pdf?index=trueIn PDF document text
    • http://posazexemonepen.rf.gd/80896770904.pdfIn PDF document text
    • https://459fb65c-52af-4c88-885a-43a44fbeaf25.filesusr.com/ugd/6a7407_24dc026f248745ad95cdc2250143a9a8.pdf?index=trueIn PDF document text
    • http://lolowavedipugis.rf.gd/cost_and_management_accounting_exam_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabisura/nujoruloxawifewebobipoz.pdfIn PDF document text
    • https://68358877-4ee6-4e53-94f7-4bd9665c1f53.filesusr.com/ugd/3bbd68_e1cfe821134540dbb340e9e72f4c74ed.pdf?index=trueIn PDF document text
    • https://1d20f49f-ccd6-4d05-b9af-9ecc574be1a3.filesusr.com/ugd/7b50d7_dc210d65472f4d68a1eecd690e88d844.pdf?index=trueIn PDF document text
    • https://05f6fcc2-a4c7-4d5b-b58c-97b640a93f4d.filesusr.com/ugd/74147a_907563d9e53d4b148216178c076a7932.pdf?index=trueIn PDF document text
    • http://niguwez.epizy.com/gesuj.pdfIn PDF document text
    • https://s3.amazonaws.com/zifozujiwi/wonazowinirug.pdfIn PDF document text
    • https://d99d9bf7-a5e0-49f2-90ac-0d1bc881463d.filesusr.com/ugd/0182ef_08e10c77934046189d451ff0f56bafc6.pdf?index=trueIn PDF document text
    • https://15e12281-0fef-4bb1-b284-2b61ddec1698.filesusr.com/ugd/6c5390_d62d1ae06ae64d8eab89c022ee2694b5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rebomedug/formatting_sql_query_online.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E2 5692 bytes
SHA-256: a4f1c54a050ce2efdab4440f03de760c02f95dbdcab292f54353930c868e2d19
font_01_sfnt_off0000f42b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42B 13820 bytes
SHA-256: af921b9a6ca92e8f91bad6dc29f7fc0dcb824b814ea8ff1f85948b004158b733
font_02_sfnt_off00011f7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F7D 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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