Malicious PDF — malware analysis report

Static analysis result for SHA-256 48ac9d63eeff2642…

MALICIOUS

PDF

78.3 KB Created: 2021-04-25 06:44:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b597f80e82024c5cbde6c07848c2cddb SHA-1: 116a0defe0578a8f5dbcd81b7a0aedae87ed833a SHA-256: 48ac9d63eeff26424336e07e418dc9bfe90b15cb196761758b8da1499604561b
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 0.9993

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://midufefew.ru/strik?utm_term=how+to+reset+air-lap1142n-e-k9 PDF link annotation
    • http://lorezagosuvese.scienceontheweb.net/60544716000.pdfIn PDF document text
    • https://cdn.sqhk.co/gafisasiwu/ijehagd/87607231129.pdfIn PDF document text
    • https://cdn.sqhk.co/nokotadi/hfififV/73818624885.pdfIn PDF document text
    • http://goproits.com/fsc_fpic_guidelinesg6j2x.pdfIn PDF document text
    • http://jufanurozud.getenjoyment.net/55200407492.pdfIn PDF document text
    • http://zuzatew.medianewsonline.com/nadoxodekutu.pdfIn PDF document text
    • https://cdn.sqhk.co/mitugejaxel/isjbEtg/jaxopabututirur.pdfIn PDF document text
    • https://cdn.sqhk.co/dodamewope/jgqhegh/25167311836.pdfIn PDF document text
    • https://cdn.sqhk.co/linidivez/jhfgihb/infinite_lagrange_multiplier.pdfIn PDF document text
    • http://myfirstsite.xyz/notafikezinul9yewz.pdfIn PDF document text
    • https://cdn.sqhk.co/fowizolomam/bANOop5/asteroid_election_day_size.pdfIn PDF document text
    • http://world-wild-shop.com/how_to_start_acting_for_beginnerskxpb3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zijiwaras.onlinewebshop.net/79881738047.pdfIn PDF document text
    • https://9042e326-c85f-44e6-b9b6-0c206471fdba.filesusr.com/ugd/0d2fda_b9ec7900a65e4f8cb851b8869434dc59.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lupebesu/alaska_driving_permit_study_guide.pdfIn PDF document text
    • https://a5a8f6e1-24ae-425c-880d-6f4079e3c376.filesusr.com/ugd/035627_9b2d204018914be1baf826414ad8e8ab.pdf?index=trueIn PDF document text
    • https://9005a25f-7293-4a73-bb0f-bc58e8c16807.filesusr.com/ugd/e3834b_08f22a88362e4eef93959baffc4aa1f3.pdf?index=trueIn PDF document text
    • https://adc0bc6f-2b4d-4951-bce0-9128d215fa34.filesusr.com/ugd/5ea4d5_ee2e06c7cbd0498ab2ebea0a09e63663.pdf?index=trueIn PDF document text
    • https://73099f28-10d5-4558-98a1-2f8dc61f1a2f.filesusr.com/ugd/f62eaa_ae58cf3599d941398eced756f9d54878.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/godewumazek/paduwivezakakemoj.pdfIn PDF document text
    • http://tizexazebubo.atwebpages.com/yongnuo_yn-560_ii_flash_trigger.pdfIn PDF document text
    • https://s3.amazonaws.com/pipaneku/romagabowoxu.pdfIn PDF document text
    • https://s3.amazonaws.com/navoburarovada/70826912523.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_off0000f07c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF07C 5392 bytes
SHA-256: f030a207fcd26ee8e5ccf6d530b1066004e07d6e982d2efd7192269fd3023f59
font_01_sfnt_off000102fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102FE 11420 bytes
SHA-256: 17851ff3955519546ece397a07ce6898f6abb40907e347d4f85963af4d325005

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