Malicious PDF — malware analysis report

Static analysis result for SHA-256 d79bfccd22b3f2ee…

MALICIOUS

PDF

95.0 KB Created: 2021-06-07 22:03:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 7f5b3d64f6e8f442f961bcf8f865f83f SHA-1: e582f11d964f90a1b443653575d1752f68b192d3 SHA-256: d79bfccd22b3f2ee6f4a483b6edf36da5c2186bbeb81bd215c7aa8f7db2f3351
194 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, indicating it's part of a link farm designed to redirect users to potentially harmful content. The PDF contains numerous external links, many hosted on disposable domains, suggesting a phishing or SEO manipulation scheme. While no scripts were directly extracted, the presence of external links and the nature of the link farm heuristic point towards an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://oniceh.ru/pbw?utm_term=disbelief+papyrus+phase+3+remix PDF link annotation
    • https://dudabiwik.weebly.com/uploads/1/3/4/3/134354119/6bf404b1bf4.pdfIn PDF document text
    • https://dujikofuzi.weebly.com/uploads/1/3/4/6/134610135/70e5e400b07a13c.pdfIn PDF document text
    • https://wisamifogafize.weebly.com/uploads/1/3/4/5/134598642/c0c6230a3634435.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428335/normal_5fffaedb01769.pdfIn PDF document text
    • https://wosowabo.weebly.com/uploads/1/3/4/3/134340570/nupudinogebadofedi.pdfIn PDF document text
    • https://figiroxofidun.weebly.com/uploads/1/3/0/7/130740151/4384420.pdfIn PDF document text
    • https://zekisotirateme.weebly.com/uploads/1/3/4/3/134368555/5e570804e03.pdfIn PDF document text
    • https://jaxedafotonomut.weebly.com/uploads/1/3/4/8/134885779/9332818.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403946/normal_60176d979b3cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490746/normal_5fdac57e3cae8.pdfIn PDF document text
    • https://pepadamive.weebly.com/uploads/1/3/4/4/134468065/2402979.pdfIn PDF document text
    • https://kefavevanafas.weebly.com/uploads/1/3/4/6/134633526/6599549.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://rukuvekuke.pbworks.com/f/fiwizewakimupuzudo.pdfIn PDF document text
    • http://fulusivijomu.pbworks.com/w/file/fetch/144764934/gufozoxezud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb1a0823-9d2a-4a92-ae29-df74db312c53/traffic_racer_hack_app_download_ios.pdfIn PDF document text
    • http://kumarifili.pbworks.com/w/file/fetch/144640071/vezow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa6e4dd5-b9d7-4ce7-98c1-b2a34374f15f/92457736926.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30a338e2-fd51-4d7b-95b9-d938a356ee93/widewosil.pdfIn PDF document text
    • http://noxiwako.pbworks.com/w/file/fetch/144648573/75965877737.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03a1b565-16fa-48ae-bcd8-6784026ce5c4/44229725393.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7dba390-33d5-4a8b-9651-c162a9143921/kazogitu.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10799 3572 bytes
SHA-256: 052c2ad7bdbed54e8ce82116606a118f0d5f2f6ad11b606989825eedfe8e9008
font_01_sfnt_off00011477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11477 5200 bytes
SHA-256: 4e01833e38b0e77ae12cd1a75fbd0aa4deefc8ed5d430ba311454d6d7bc77df6
font_02_sfnt_off0001261f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1261F 3940 bytes
SHA-256: 67925314b544d55422fd711f3f5f05b05cdd73a5884e296a2c21b4803829718b
font_03_sfnt_off000134cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134CD 12828 bytes
SHA-256: d3e8cecf6364a5c0f717b85e6872382c4f5cf47436c496643c3217645c7488aa
font_04_sfnt_off00015f98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F98 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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