Malicious PDF — malware analysis report

Static analysis result for SHA-256 556316e15e28c906…

MALICIOUS

PDF

71.3 KB Created: 2021-05-10 04:05:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 42d535d18b1a5e7fbb5d32739b250eff SHA-1: 587918cad3f1ab05217b718713e993ea78cd6567 SHA-256: 556316e15e28c906fdc34c7af4bf5862cde70748bbf524ba78664edbbf936429
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of external URIs and the link farm heuristic suggest the document's primary purpose is to drive traffic to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://zajinet.ru/strik?utm_term=libro+recetas+de+sascha+fitness+pdf+gratis PDF link annotation
    • https://zuriloteva.weebly.com/uploads/1/3/4/6/134623588/gareluvidifu_dewofovimazopes_fofari.pdfIn PDF document text
    • http://natnat.fun/95036228618ub75a.pdfIn PDF document text
    • https://zabuxowinuj.weebly.com/uploads/1/3/4/8/134874463/lonofeded.pdfIn PDF document text
    • http://teligelufinuv.iblogger.org/29949998514.pdfIn PDF document text
    • http://ampinternational.org/bunker_fuel_marketxfdpb.pdfIn PDF document text
    • http://oneshops.space/wupujegineruzugs0d6.pdfIn PDF document text
    • http://sekujirimabasas.getenjoyment.net/fallacy_of_composition_examples.pdfIn PDF document text
    • http://kinemulawaw.sportsontheweb.net/kazugomolawawi.pdfIn PDF document text
    • https://nazesamujev.weebly.com/uploads/1/3/1/3/131397942/be8d604a91.pdfIn PDF document text
    • http://buwoworavo.22web.org/biomass_energy_conversion_technologies.pdfIn PDF document text
    • http://workshop-fb.ru/2e_chronomanceruzu21.pdfIn PDF document text
    • http://izzzaaa.space/good_samaritan_nuns8o7gf.pdfIn PDF document text
    • http://megantv.site/sociological_imagination_charles_wright_millshw8ha.pdfIn PDF document text
    • https://gugekomu.weebly.com/uploads/1/3/0/9/130969097/f5dae6360.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/buwosevax/pufubifizesurogolimotop.pdfIn PDF document text
    • http://zodiripek.myartsonline.com/19795792801.pdfIn PDF document text
    • http://takoxiwewol.epizy.com/new_immunization_schedule_2020.pdfIn PDF document text
    • http://safedoguno.onlinewebshop.net/best_app_to_annotate_ipad_pro.pdfIn PDF document text
    • http://xepipigedizovo.rf.gd/gojatigisubalap.pdfIn PDF document text
    • https://s3.amazonaws.com/nufidibodudulad/why_is_my_hoover_carpet_cleaner_not_spraying_water.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_off0000d525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD525 5468 bytes
SHA-256: 0169ae2cd9b647721082f74f4965a30fb5dd8fbed6c1d2fd0ea8dbdbc70730df
font_01_sfnt_off0000e7b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B6 11708 bytes
SHA-256: 7456f1e137b775de7dfa9dce484fe219a68bc57f42a28af9c108703b5e52d636

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