Malicious PDF — malware analysis report

Static analysis result for SHA-256 186c9b5789bf789b…

MALICIOUS

PDF

81.9 KB Created: 2021-03-26 06:30:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9cb90ecb5abde09667477c2c663a748d SHA-1: 9a0c46b4c2bc146006dbe09543ca94dce97b36cc SHA-256: 186c9b5789bf789bfbe39ab0b4c3e8c1bb21fe4c0f272eb59eb619a2bb381733
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 0.9996

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=what+is+the+molar+mass+of+nac2h3o2+%25E2%2580%25A2+3h2o PDF link annotation
    • http://gefejisu.22web.org/building_construction_technology_gtu_book.pdfIn PDF document text
    • http://rikafitamedad.medianewsonline.com/antonyms_and_synonyms_list_a_to_z.pdfIn PDF document text
    • http://zamowafa.mywebcommunity.org/galevamajaziwotuvutima.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479921/normal_5fd2947099d12.pdfIn PDF document text
    • http://rasidafepu.mypressonline.com/emerald_tablets_of_thoth_doreal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413122/normal_605cafdd562d8.pdfIn PDF document text
    • http://salizurewaki.mypressonline.com/26949518042.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469116/normal_6051715cd479a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370265/normal_604aa53adfd1d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wokarodefi.onlinewebshop.net/83674989646.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77fa0c6c-c080-4c7f-941a-9abb2055ec75/20113609236.pdfIn PDF document text
    • http://padukejuredi.rf.gd/vutakinafitoriweripos.pdfIn PDF document text
    • http://wutivufugisev.epizy.com/bobusevojenavivavata.pdfIn PDF document text
    • http://widepidaba.atwebpages.com/12139634958.pdfIn PDF document text
    • https://c183b790-cb34-49aa-848e-1a9f2b14dda3.filesusr.com/ugd/d8966e_cccf60d697a544d6987fe749510aeb84.pdf?index=trueIn PDF document text
    • https://e222b685-7c7f-4cee-b050-218328c89257.filesusr.com/ugd/c0232f_c2a3bd286714447bbdcc6e19bf46b929.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ee29822-92c3-49b2-9cad-bcf7f18ceaea/bemawepex.pdfIn PDF document text
    • https://baad1762-ad72-434c-be9a-9de7d8068d01.filesusr.com/ugd/61395f_71f9fe9e60a743a7b692e75e5230d2cf.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE87 2900 bytes
SHA-256: b3dfb2f2c41da7350fc3755141d2fd0ea5796bb125df25fec831093623ff73df
font_01_sfnt_off0000e8ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CA 5492 bytes
SHA-256: 011fec52ce4925dda238d1d4ecf0c461a973ca4e5e1cb00bc24a281e11abfbbf
font_02_sfnt_off0000fb5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5D 11484 bytes
SHA-256: 832dc5b00ffb4411c8d4f85223e8c0582f923ff50b3ef3bb6d4b07c23a70de2d
font_03_sfnt_off0001229b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1229B 16060 bytes
SHA-256: 713933360072c9d59346590fad668f98c3603c6d2b72ed941ce85481f6af0b74

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