Malicious PDF — malware analysis report

Static analysis result for SHA-256 1edbc312139f2aee…

MALICIOUS

PDF

111.1 KB Created: 2021-05-01 11:24:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 62beef38b82752076d32bec91ee80aeb SHA-1: 762c09e341b968ec7a07f1fd58cb82647c8018da SHA-256: 1edbc312139f2aee3cd2187fed9d7bc7ea196204826bf2e484c85afd827ae46b
226 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO spamming operation. Several heuristics, including PDF_SEO_LINK_FARM and PDF_SUSPICIOUS_LINK_LURE, highlight this behavior. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing or malware distribution sites. No scripts were extracted, but the PDF structure itself is used to facilitate the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://nipisod.ru/strik?utm_term=how+to+study+for+civil+engineering PDF link annotation
    • https://mesikanuxiruk.weebly.com/uploads/1/3/1/6/131636832/mivanizenef-fakijiripop-sanusuduzuk.pdfIn PDF document text
    • http://azorocheat6.xyz/406851896687t32c.pdfIn PDF document text
    • http://teksalle.xyz/seperusijiledakycb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426269/normal_606792dfe6705.pdfIn PDF document text
    • http://xovitixekewelom.scienceontheweb.net/subuwizilivojadutamu.pdfIn PDF document text
    • http://dk-inc.xyz/plato_republic_book_2_and_3_summarygf5u5.pdfIn PDF document text
    • https://tatogupuragafa.weebly.com/uploads/1/3/4/0/134096405/roxevirisexokivajob.pdfIn PDF document text
    • https://kimilofu.weebly.com/uploads/1/3/0/8/130873947/xerawidow-sopujikuz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403421/normal_5fef96c022028.pdfIn PDF document text
    • https://dixozetazexode.weebly.com/uploads/1/3/4/4/134472526/6196352.pdfIn PDF document text
    • https://genamimiwovem.weebly.com/uploads/1/3/1/6/131636881/diketi-sudakizazegogon-wagepojenima.pdfIn PDF document text
    • https://tubuwixufadone.weebly.com/uploads/1/3/5/3/135315283/65f661.pdfIn PDF document text
    • http://securityofusersdevicesonline.site/what_are_the_names_of_all_12_disciples9hof6.pdfIn PDF document text
    • http://nekuwagibajese.getenjoyment.net/urie_bronfenbrenner_ecological_model.pdfIn PDF document text
    • http://usene.xyz/kookaburra_batting_gloves_size_guidexf4gx.pdfIn PDF document text
    • https://denesibupu.weebly.com/uploads/1/3/0/7/130774977/razekireveja.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://d6236f05-450e-4b96-9875-1783d83c708b.filesusr.com/ugd/912de2_5e8b3f6730a443509eeef7daad21e87c.pdf?index=trueIn PDF document text
    • https://71f68c9c-1037-483c-a0ca-f268b7ddd3c8.filesusr.com/ugd/87fdc7_ff3772c53d0145debf0582a3096f0023.pdf?index=trueIn PDF document text
    • https://c8019651-2137-4367-b38e-775fff3f8a75.filesusr.com/ugd/fc5a02_7d7a22fc7ffc4793a06ef0746190e48d.pdf?index=trueIn PDF document text
    • http://jabodegodonirad.atwebpages.com/vocabulary_workshop_level_d_unit_6_antonyms_answers.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_off00016add.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16ADD 5076 bytes
SHA-256: 5305a71c5688f3a4c31a9c54c6298a30f54c6bea248b2ba297f76958407b8a68
font_01_sfnt_off00017c47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C47 10776 bytes
SHA-256: 7da3b7107b1b4a9dfcb7317c1cb49cd2390a379e9dd2001bad6e4e3514ab0000
font_02_sfnt_off0001a11e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A11E 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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