Malicious PDF — malware analysis report

Static analysis result for SHA-256 821f04dc93248d5e…

MALICIOUS

PDF

73.1 KB Created: 2021-03-02 23:39:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 9839aba983b18e9183be6a1b47bef123 SHA-1: 72326bb79f3bc214eed2d02d19822def720c4203 SHA-256: 821f04dc93248d5ed712c5e971b6d305a8d948260ed3430de589e904be9d6bf4
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, with a primary external URI pointing to `https://mezovuduw.ru/123?utm_term=how+to+use+aroma+rice+cooker+for+brown+rice`. The PDF also exhibits characteristics of a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. No scripts were extracted, but the overall structure and URL patterns are indicative of a malicious phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://mezovuduw.ru/123?utm_term=how+to+use+aroma+rice+cooker+for+brown+rice PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4386092/normal_60062dfb2caaf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451755/normal_5ff2b997b3123.pdfIn PDF document text
    • http://bubuwem.iblogger.org/wizuso.pdfIn PDF document text
    • https://cdn.sqhk.co/tinolaseja/jiVgdFy/traincontroller_9_gold_lizenzschlussel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478438/normal_6023b9aabfc0f.pdfIn PDF document text
    • http://zodelem.mygamesonline.org/lovukakavedep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496404/normal_600c246b6a475.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369496/normal_5fc9f21935b66.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487623/normal_603c826cab15d.pdfIn PDF document text
    • http://xejepurefe.scienceontheweb.net/50_liters_of_oxygen_is_what_percentage.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417658/normal_60395b1d1f834.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365612/normal_5ffb1aea15929.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://faxiruvud.myartsonline.com/19224922319.pdfIn PDF document text
    • https://s3.amazonaws.com/juvuraguvutoxif/vifujapif.pdfIn PDF document text
    • https://s3.amazonaws.com/rebomedug/steps_involved_in_software_testing_life_cycle.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE111 5252 bytes
SHA-256: 843d526fb016568619c2342c102b24a784eb33db7ff4c2d87dfd2ad0c399a4c9
font_01_sfnt_off0000f2ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EC 10756 bytes
SHA-256: d007ecb39046d558c9bcfe8aaf538862d33506a9dbc48b7f8a63fa43e36564f3

Open this report in the interactive analyzer, or submit your own file for analysis.