Malicious PDF — malware analysis report

Static analysis result for SHA-256 47c9f766b7d31a40…

MALICIOUS

PDF

99.0 KB Created: 2020-11-23 18:45:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: afacb32d7522ee400f27374d7ac3c992 SHA-1: 1834dca01af0bc707768a96fcc3546e7d82174ef SHA-256: 47c9f766b7d31a4091b79f94f9bc13935e256dbfca9ff4d6b21ec150348440b5
232 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by multiple heuristics, including ML classification and ClamAV, indicating it is a phishing attempt. It impersonates WhatsApp and uses urgency lures to trick the user into clicking a link hosted on weebly.com, which likely leads to credential harvesting. The PDF also contains a large number of external links, suggesting it may be part of a link farm for SEO manipulation or to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 8

  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/sidobojugonuxexoz.pdf.
  • 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
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://trafftec.ru/123?utm_term=please+confirm+receipt+of+this+email+and+attachment PDF link annotation
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/sidobojugonuxexoz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491445/normal_5faeb706147fd.pdfIn PDF document text
    • https://netaluzubik.weebly.com/uploads/1/3/0/8/130813777/kekunolelix.pdfIn PDF document text
    • https://zukamukenipebo.weebly.com/uploads/1/3/1/3/131380388/3c30e9ffd729.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/977214ae-f335-41dc-9f42-b582b980b749/delta_shower_cartridge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e83587c3-bba7-44b7-b307-1dd4052809ae/cream_dapple_dachshund.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c4ccba2-9844-4e82-8293-ef1a276905f1/70093901531.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18a8c141-0ecb-434b-8ed3-a84cbae5bfd7/71440478200.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10053fe0-251d-4122-a67a-c54a19713011/resources_in_northern_europe.pdfIn PDF document text
    • https://s3.amazonaws.com/tibanepoxilibud/harvard_referencing_website_example.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_off00013dd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DD1 2828 bytes
SHA-256: 4aba2bb845853324476be69e5ed1bf4ff35002942389efac2b843cac1129f0e9
font_01_sfnt_off000147cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147CC 5396 bytes
SHA-256: 413f7b804e7b677f627d43205212c6f2f1c35938a63fdcce2f2625b272b9ca5a
font_02_sfnt_off000159fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159FA 10696 bytes
SHA-256: 75843efa3ad2379bd32b6167e6b5ff638b55b3f60c70960a380121adbb14bdcb

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