Malicious PDF — malware analysis report

Static analysis result for SHA-256 f120cf38be87397b…

MALICIOUS

PDF

129.0 KB Created: 2021-01-04 11:46:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 44d8f2c5dadde9d50257e5ad94fc4fde SHA-1: ea42a7a4e547705023dcbaf622dc4781d0ab5c21 SHA-256: f120cf38be87397b23c82cda46e41b8b5735595ebd636b0c9d531c0dcf9071f7
184 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are hosted on Weebly subdomains and appear to be part of a link farm. The 'SE_BRAND_CREDENTIAL_PHISH' heuristic specifically identifies a LinkedIn impersonation lure pointing to a redirector URL. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest a phishing or credential harvesting attempt, likely leveraging embedded JavaScript for redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier clean score 0.1176

Heuristics 5

  • 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://vufagejibuto.weebly.com/uploads/1/3/1/4/131483336/9091038.pdf.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://traffset.ru/123?utm_term=wurm+unlimited+skill+guide PDF link annotation
    • https://vufagejibuto.weebly.com/uploads/1/3/1/4/131483336/9091038.pdfIn PDF document text
    • https://guliwomijura.weebly.com/uploads/1/3/4/8/134846957/4753274.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456121/normal_5fa58c671e64c.pdfIn PDF document text
    • https://cdn.sqhk.co/lidupusumoj/h6gcqjj/crazy_coincidence_stories.pdfIn PDF document text
    • https://cdn.sqhk.co/vakanaju/ihiiw4S/55980149331.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fasanag/1974735384.pdfIn PDF document text
    • https://s3.amazonaws.com/paropabaru/gomexakiduxamavezawated.pdfIn PDF document text
    • https://s3.amazonaws.com/jozaponi/lefabuvejajofutiparewowi.pdfIn PDF document text
    • https://s3.amazonaws.com/luworizesupox/attributes_of_form_element_in_html.pdfIn PDF document text
    • https://s3.amazonaws.com/bolovopizonuki/angular_reactive_form_control_get_value.pdfIn PDF document text
    • https://s3.amazonaws.com/pukiza/cpap_sleep_report_events_per_hour.pdfIn PDF document text
    • https://s3.amazonaws.com/bufexa/loctite_5510_datasheet.pdfIn PDF document text
    • https://s3.amazonaws.com/xebareto/comptia_network_n10_007_study_guide.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000198ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x198BA 5012 bytes
SHA-256: 9acebd790498670af4d890beb22001bf19ea8d7a3cfba1397690a705386264bc
font_01_sfnt_off0001a9b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A9B6 2904 bytes
SHA-256: a0fe2daada3f9176e98494b10909635b23cf183d11683fbcbfedfb157e9710fb
font_02_sfnt_off0001b5ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B5AB 16940 bytes
SHA-256: c31083493dd8f1a6be20fb2c7b44742c18f939f8f3bbd4dc7087dbd8185415fb
font_03_sfnt_off0001ea40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EA40 16160 bytes
SHA-256: 53c3ec829963ec5a0af1bff4be2d724acb9959b277e5253d769434e6be684fe1

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