Malicious PDF — malware analysis report

Static analysis result for SHA-256 31e4d52fbb9c2fba…

MALICIOUS

PDF

77.9 KB Created: 2021-03-08 01:20:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: ff51b4f25e055810efdf3b4d2c2c8ffd SHA-1: 8ac514cd0e5c3b136de2b0ccc10dc26e7c9c6309 SHA-256: 31e4d52fbb9c2fba3650b1838ed2c2dd3dc1556be692914fa5ae1af035661e68
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://vilenefex.ru/strik?utm_term=speedlight+sb-600+compatibility PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4415530/normal_5fe6f0413303a.pdfIn PDF document text
    • http://vittorguxx.site/niguwelamimozobasepebuxitquw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492880/normal_603dfc8049e9a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485442/normal_5fe3f404b5e88.pdfIn PDF document text
    • http://japancar-sib.ru/cyberpunk_2077_release_date_xbox_series_x4cr6b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454422/normal_601689d84343f.pdfIn PDF document text
    • http://itnegozio.info/cuantas_formas_de_ecuaciones_cuadraticas_haynqb7p.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366312/normal_60143ca77734d.pdfIn PDF document text
    • http://sawemawe.mywebcommunity.org/64626333733.pdfIn PDF document text
    • http://mapotilij.mygamesonline.org/xejunosisegap.pdfIn PDF document text
    • http://bafiselavanebep.mywebcommunity.org/zaban.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480187/normal_5fdac505d3ba4.pdfIn PDF document text
    • http://ravovenovibu.medianewsonline.com/how_to_write_roman_number_100.pdfIn PDF document text
    • http://fukazab.mywebcommunity.org/how_much_is_amazon_echo_dot_uk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zatuvejamubolo.atwebpages.com/dd-wrt_repeater_mode_not_available.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5baf89c4-a15a-4bfa-a2a7-4ff9afdee92e/introduction_to_chemical_engineering_fluid_mechanics_solutions_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bac93315-ebdc-4802-913c-8b06badacdaf/free_downloadable_quick_study_guides.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/901ab3fd-7dca-4fab-840a-94c56b467bfa/what_child_is_this_lyrics_and_chords.pdfIn PDF document text
    • http://piwakitidi.onlinewebshop.net/wubakijowarubug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8391e6e-f6b6-4e94-b32a-4932bdca8420/what_is_the_most_famous_quote_from_romeo_and_juliet.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_off0000f04e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04E 6064 bytes
SHA-256: 472f68152075bd98d82c8ab3995e2ff97cb54e52ad32a82a10b7a47d1a12d7d5
font_01_sfnt_off000104cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CD 11068 bytes
SHA-256: 7a780ebbeb1c8b6e966ebd9ec1817ad2620824802e0e59d97b0844c1c32eeb60

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