Malicious PDF — malware analysis report

Static analysis result for SHA-256 43855a2443dfc753…

MALICIOUS

PDF

79.5 KB Created: 2021-03-22 07:12:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: d9ec684cedb1d5b36ba0f9aba21a8b25 SHA-1: 27333c291cfeb463170a6bd32c1fb3a112dee397 SHA-256: 43855a2443dfc753f4cde4af250aaab5eaeb9ceb660879ee43aa06f550cbbf3e
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 0.9994

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://druttle.ru/strik?utm_term=network+security+engineer+salary+2019 PDF link annotation
    • http://wobokegidutijem.iblogger.org/3_beep_bios_code.pdfIn PDF document text
    • http://50offshop.info/canada_provinces_and_capitals_map85dhb.pdfIn PDF document text
    • http://tonevagewalilu.medianewsonline.com/pemafoxit.pdfIn PDF document text
    • https://cdn.sqhk.co/diwiporeb/qjQgfhG/tovogirubakuzamisuk.pdfIn PDF document text
    • https://cdn.sqhk.co/purizepore/Nihchbf/ovilex_driving_school_2019_apk_mod.pdfIn PDF document text
    • http://gallery-shop.site/what_is_a_sentence_for_daytimexd8eo.pdfIn PDF document text
    • http://zekabivalejasaj.22web.org/wow_warlock_leveling_guide_1-_90.pdfIn PDF document text
    • https://cdn.sqhk.co/jegamaxegev/djdBR5O/giant_io_mod_apk_revdl.pdfIn PDF document text
    • http://minesaxofunawi.getenjoyment.net/93674304535.pdfIn PDF document text
    • https://cdn.sqhk.co/rabataxuvax/jXhcATh/wuzeke.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/bf2792ec-280b-49aa-bb7c-59c727e677c0/hype_active_gear_bluetooth_earbuds.pdfIn PDF document text
    • http://dupikupujetilu.rf.gd/catholic_answers_live_number.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8dfbd4a-c2d3-46c0-80b1-9d0aafae7d69/amsco_apush_2015_online.pdfIn PDF document text
    • https://40e214c1-1950-44e8-a195-e2c6eeb23253.filesusr.com/ugd/a517f4_eb80488dd8764728b97e610a03c1eed5.pdf?index=trueIn PDF document text
    • http://fepobetef.rf.gd/how_much_for_electric_pallet_jack.pdfIn PDF document text
    • http://tiwatimab.atwebpages.com/how_to_choose_a_reiki_practitioner.pdfIn PDF document text
    • https://bea00909-aa88-4d38-ac88-e56db460b486.filesusr.com/ugd/923104_5260baa3107949f0bd16c6dd5be843a1.pdf?index=trueIn PDF document text
    • https://645c32c3-7e99-4959-b93b-7980205539d7.filesusr.com/ugd/30a31c_4ddeaef6dc60407b8a9158ce1070d904.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0dd4fbc-9cec-4dc8-b313-67e114c24c88/womezilibe.pdfIn PDF document text
    • http://goguvero.epizy.com/bojuxumub.pdfIn PDF document text
    • http://fidalanono.myartsonline.com/73753977905.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1eff0430-b0ba-4b48-b09c-6291926c98ad/38888007787.pdfIn PDF document text
    • http://xonolori.atwebpages.com/andreas_moritz_libros_gratis.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_off0000f6ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6ED 5676 bytes
SHA-256: ed58c0fc21a656a48ad0fd6374867b69b610a90d5eb57cc21dcf7f5e1b0cec6e
font_01_sfnt_off00010a7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7A 11212 bytes
SHA-256: 712a549328069a08f33d1a0c1073d48f8852783f368a8c16f45eea46647f225d

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