Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebcd460f1afd201d…

MALICIOUS

PDF

73.5 KB Created: 2021-02-13 08:59:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: a665d1007a3f21011c5a9354f2970cdf SHA-1: 3d9a4ceb4c4af21bebf45cd1f46cd647aa2a3a2e SHA-256: ebcd460f1afd201df6acf913b0a6cf0a3dcf96ee205144a69ad9e1c8e9097176
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The document body's content is largely unreadable due to encoding, but the presence of URLs and the heuristic firings are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://baarspo.ru/123?utm_term=where+are+the+baroreceptors+located PDF link annotation
    • https://piwaxokireruber.weebly.com/uploads/1/3/0/9/130969414/bumogawarasagejewuze.pdfIn PDF document text
    • http://ionatr.fun/data_structures_algorithms_and_software_principles_in_cbeov0.pdfIn PDF document text
    • https://cdn.sqhk.co/sileluzorupo/9mvx4jM/16512326141.pdfIn PDF document text
    • https://cdn.sqhk.co/kojetovukufo/hghb2ZR/nenazipaziwemukako.pdfIn PDF document text
    • https://cdn.sqhk.co/kopilixa/fc9jgaf/79466341299.pdfIn PDF document text
    • https://cdn.sqhk.co/regavebike/GooxJhh/amazon_prime_music_family_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/novitovikor/hbTrhgi/capitalist_food_chain.pdfIn PDF document text
    • http://salestore.pro/pro_fitness_rowing_machine_partsn0pkd.pdfIn PDF document text
    • https://cdn.sqhk.co/zanotunuzi/hws6wg4/how_to_draw_horror_characters_book.pdfIn PDF document text
    • http://taher-tcac.com/kazivosimamirepabizimes5sfkf.pdfIn PDF document text
    • https://cdn.sqhk.co/patagarinixa/Pbhc9hd/wikewagefugutokugir.pdfIn PDF document text
    • http://stat-index-co.com/kafikusobotokomepupgha3o.pdfIn PDF document text
    • http://frukt.fun/bharathiyar_kavithaigal_book_free50dcs.pdfIn PDF document text
    • https://cdn.sqhk.co/fofanibiv/whagVhf/53212739412.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nowivopikuzud.epizy.com/dasuwemivijizenevolikifob.pdfIn PDF document text
    • http://xixoxamevat.epizy.com/moronum.pdfIn PDF document text
    • http://rebubokinore.epizy.com/xuvumid.pdfIn PDF document text
    • http://gijomifede.rf.gd/jana_gana_mana_violin_sheet_music.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_off0000e3f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F4 5312 bytes
SHA-256: 7f94dff7bb35af4e927cd3271d2b1b8b0d9fa78cdda4a00cccc60121e4be9a21
font_01_sfnt_off0000f600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF600 10076 bytes
SHA-256: c7def0856c792628c63018f412de58ebfadb4c977b02e791deef98209538b56a

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