Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ca8b26b735038e2…

MALICIOUS

PDF

77.9 KB Created: 2021-03-21 22:05:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 39f237942eeb8671192e0d150e00a59e SHA-1: 91015dc45613de1094f8ec44fbe2d74d847be0c0 SHA-256: 7ca8b26b735038e2d1757de3c8b27a1723d1c4505a5f97b39e16e36accadb873
126 Risk Score

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=simplehuman+auto+hand+soap+dispenser PDF link annotation
    • https://kobekasi.weebly.com/uploads/1/3/4/5/134588699/libiwezozesigab-nixofemile.pdfIn PDF document text
    • http://tasigezagu.scienceontheweb.net/carcharhinus_longimanus.pdfIn PDF document text
    • http://pomirkapa.site/kadir_gne_arapa_trke_szlkbfyw4.pdfIn PDF document text
    • https://ririzunok.weebly.com/uploads/1/3/4/7/134712782/lilaxiw-wulud-xafeva.pdfIn PDF document text
    • https://vuvitolivudiru.weebly.com/uploads/1/3/2/7/132712253/tutax.pdfIn PDF document text
    • https://bidelokezigakal.weebly.com/uploads/1/3/4/3/134342752/nixebawa_lajerogowe_tamope.pdfIn PDF document text
    • http://wazepewazivulil.mywebcommunity.org/73249029382.pdfIn PDF document text
    • http://fionainthefield.org/wamoponigawumukemub3spuv.pdfIn PDF document text
    • https://gojemafofapuvog.weebly.com/uploads/1/3/2/6/132681271/6389328.pdfIn PDF document text
    • http://gouliwer.online/nulovegixifelulinge3ck.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nulesade.epizy.com/nifogobutoraladozezugeta.pdfIn PDF document text
    • https://s3.amazonaws.com/tubukeganuji/98544483375.pdfIn PDF document text
    • http://sosozodazu.epizy.com/40090787808.pdfIn PDF document text
    • https://s3.amazonaws.com/pivetuzadujo/magazine_design_template_illustrator.pdfIn PDF document text
    • http://tenedurexijipes.epizy.com/27612118178.pdfIn PDF document text
    • https://s3.amazonaws.com/fekazudabo/pizuwuzuveputini.pdfIn PDF document text
    • http://kawifubojemex.rf.gd/how_to_set_sharp_atomic_clock_spc373.pdfIn PDF document text
    • http://xidudoz.rf.gd/jadikodavo.pdfIn PDF document text
    • http://nerelikeg.epizy.com/26673817480.pdfIn PDF document text
    • http://laxojidosap.epizy.com/60593739498.pdfIn PDF document text
    • http://podadanojiwa.epizy.com/amaravathi_tamil_movie_free.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_off0000ef71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF71 5304 bytes
SHA-256: 79caef53d3331d6c8e78ebb8588401b09a61d51587a1fb89154176d5442cf712
font_01_sfnt_off00010142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10142 11476 bytes
SHA-256: bb469b1cd695e90ce4f394a0d1f203cd7dbeeb34a71a039a895b350648dbb30a

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