Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c62cd6e7d174609…

MALICIOUS

PDF

81.0 KB Created: 2021-09-14 14:09:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5505ae18862b8189d62e31a8bb9f7fc6 SHA-1: 2d56d695e92358bafce19ad2b9c939ac92832e8a SHA-256: 9c62cd6e7d1746099b8c8a0c2a523fc90f7c04a4be61ff9a7c598d5ee6f02602
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting, indicating a link farm designed to redirect users to malicious sites. The presence of external URIs and the 'link farm' heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crysiq.ru/uplcv?utm_term=average+temperature+in+nyc+in+april PDF link annotation
    • http://gurukripapublicschool.com/userfiles/file/kigekusotugesokazoje.pdfIn PDF document text
    • https://rintrans.com/files/sutamatekaguvadakileborij.pdfIn PDF document text
    • https://concurs-euclid.ro/upload/fck/nuzuwudanuwezu.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/3073288499.pdfIn PDF document text
    • https://orsam.org.tr/paketler/ckfinder/dosyalar/files/zuxebu.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-2/20210902160200469131.pdfIn PDF document text
    • http://www.enfersalus.com/ckfinder/userfiles/files/faxosotek.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-9-10/20210910060921161797.pdfIn PDF document text
    • http://designbyjoseph.com/uploads/File/wunuwelogalud.pdfIn PDF document text
    • http://sanfrancescovet.com/userfiles/files/guninilulaxiduna.pdfIn PDF document text
    • http://commsoft.nu/demo/ktb/wsmbilder/files/74929375368.pdfIn PDF document text
    • https://sankaibearing.com/userfiles/files/78403489101.pdfIn PDF document text
    • https://concertwristband.com/resimler/files/xitunoruf.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5da0a7d5c---japamatosewusoxemegoxos.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109121422392820.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/togubiwasobawejuxezefil.pdfIn PDF document text
    • https://areopag.ru/sites/default/files/uploads/43036152142.pdfIn PDF document text
    • http://firesecurity.sk/userfiles/file/vamarawazefagogemo.pdfIn PDF document text
    • http://meetburgerusa.com/uploads/files/12480046383.pdfIn PDF document text
    • http://www.asiacoservice.com/file/files/27530296012.pdfIn PDF document text
    • https://classykitchen.pl/web/uploads/files/fuvitudo.pdfIn PDF document text
    • https://n-tlg.com/files/file/gasurodusidematidukonon.pdfIn PDF document text
    • http://redskap.ru/userfiles/file/xipefukekajup.pdfIn PDF document text
    • https://szallas-karpatalja.hu/upload/furijavi.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CF 17820 bytes
SHA-256: ed47dce77550bbc87236a924a1bea66a410e873f89b32f105f23a4bcc1dba076
font_01_sfnt_off000105a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011db7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB7 10688 bytes
SHA-256: 79ce0030db00c237ac145ad035b12791886e1d3d9d40d49b8b05e3a804679060

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