Malicious PDF — malware analysis report

Static analysis result for SHA-256 3487ab8fa50f409e…

MALICIOUS

PDF

81.0 KB Created: 2021-03-03 13:01:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: de5eafa4539618f393f03ce6e2a4fbe2 SHA-1: 90ec726afd6c76705cacac3a7b7bac013ef474a4 SHA-256: 3487ab8fa50f409e05b94c450df70620352a8d5af0ba8d749a7771e756b0e68f
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 0.9997

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://jumiwimov.ru/123?utm_term=adobe+premiere+pro+wedding+templates+free+download PDF link annotation
    • http://tulomodev.getenjoyment.net/25342845368.pdfIn PDF document text
    • https://cdn.sqhk.co/sifalavuxozo/ahfifha/dewolevuliwanaja.pdfIn PDF document text
    • http://good-production18.site/44919990439y00z5.pdfIn PDF document text
    • http://rugegav.mywebcommunity.org/jakoronadabofonefuvujeto.pdfIn PDF document text
    • http://rowowevu.mypressonline.com/dozijigusewugu.pdfIn PDF document text
    • http://pufaxokijajijev.22web.org/46528443630.pdfIn PDF document text
    • http://gtmedis.com/chemdraw_software_for_mac_freewzl4h.pdfIn PDF document text
    • https://cdn.sqhk.co/gobajejuz/jdjiicB/situdikapadidifunugumog.pdfIn PDF document text
    • http://okrasote.info/85708365779a0o6e.pdfIn PDF document text
    • https://cdn.sqhk.co/pinofizulag/7ihDIjf/isla_san_lucas_costa_rica_historia.pdfIn PDF document text
    • https://cdn.sqhk.co/wusakituzu/IijyFge/dovejeninisim.pdfIn PDF document text
    • https://cdn.sqhk.co/zemakojunil/h2OQmhd/loselafita.pdfIn PDF document text
    • http://technodom11.com/81886198533699f1.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
    • http://dibulazovila.rf.gd/barfi_film_kannada_song.pdfIn PDF document text
    • http://tilawiveso.rf.gd/how_to_reset_cobra_alarm_honda_city.pdfIn PDF document text
    • https://s3.amazonaws.com/megelugik/47653179140.pdfIn PDF document text
    • https://s3.amazonaws.com/vazisi/kosapepuzowezowudol.pdfIn PDF document text
    • http://falufobi.epizy.com/18382503873.pdfIn PDF document text
    • https://s3.amazonaws.com/zuses/lomiluvidizalese.pdfIn PDF document text
    • https://s3.amazonaws.com/vosimalume/59024671043.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_off0000f1d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D1 5368 bytes
SHA-256: d5fcdcbf49c668b461afba62ae3d9e8fc828fb56cd7ebb4d21bb013dba7e5a58
font_01_sfnt_off00010403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10403 10512 bytes
SHA-256: aa8e1ffaab66de1591289b480b8f9df1640aa7ee6759d5b5d093a19def3da02c
font_02_sfnt_off000127d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127D9 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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