Malicious PDF — malware analysis report

Static analysis result for SHA-256 151a15504a4fb759…

MALICIOUS

PDF

75.5 KB Created: 2021-09-19 20:42:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 39ae9ff69579073633c484f0c7d16238 SHA-1: 19f19810f6ca62b08a2ae643660a173609d199f7 SHA-256: 151a15504a4fb759a43c19fb82d9eac9b31230c688099be5badcef44507a8b6e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or malware distribution. Heuristics indicate it's a link farm on disposable hosting, and ClamAV detected it as a phishing trojan. The ML classifier also flagged it with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://coretry.ru/uplcv?utm_term=free+live+stream+logan+paul+fight PDF link annotation
    • https://calson.garment-pro.com/ckfinder/userfiles/files/janewugebofu.pdfIn PDF document text
    • http://nikkenj.com/userfiles/file/51469310729.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/junola.pdfIn PDF document text
    • http://foodzipo.com/uploads/userfiles/files/59494140450.pdfIn PDF document text
    • http://b40555.handyfriendship.com/upload/files/valitupati.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16146a7fb17a5c---gobusogifewukida.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/tojetinefiliwisaxowov.pdfIn PDF document text
    • http://weforyou.it/userfiles/files/33693034320.pdfIn PDF document text
    • https://cape-electronics.com/media/file/relizomivamaregazepu.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/1ustnom6geuf9su8359gldl34n/52842254546.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/banavamuzusov.pdfIn PDF document text
    • http://hferrynetworks.com/FileData/ckfinder/files/20210914_4327CCE67ABF2F51.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/fipigorisijuvuwiditisuzel.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/xiwitoxi.pdfIn PDF document text
    • https://austarpharma.austarchina.com/upload/files/xujowopixumom.pdfIn PDF document text
    • https://mailing.crpm.ch/ck/ckfinder/userfiles/files/wejeveruzuza.pdfIn PDF document text
    • http://www.horakgolf.cz/ckfinder/userfiles/files/pegewudajugawun.pdfIn PDF document text
    • http://kubkao-kubpla.com/userfiles/files/desewesu.pdfIn PDF document text
    • http://naturenhuman.com/app/webroot/userfiles/file/lujusukaj.pdfIn PDF document text
    • http://baiduvpn.com/upload/files/romesiditar.pdfIn PDF document text
    • http://ijfbn.com/editor_up/pafuzugobozararotepigeza.pdfIn PDF document text
    • https://sandp-engineering.com/ckfinder/userfiles/files/ladizegigazifabene.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/19177632216.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_off0000bf45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF45 18332 bytes
SHA-256: 0e0cc1e3e8748b729d11381a5b2b3e09fb5d6f82f6583181d00718136db7861d
font_01_sfnt_off0000ef38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001074f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1074F 10948 bytes
SHA-256: 8c5686398747e12b9be319afad71e5e72b1aa36347e16217c3653b9f7b413bf4

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