Malicious PDF — malware analysis report

Static analysis result for SHA-256 3aff406e545d8915…

MALICIOUS

PDF

68.0 KB Created: 2021-02-13 01:42:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: d466a8ef6acf2c4035def30cdd8a4635 SHA-1: 4be9bc06934754979d6fd7531bed9760a720dbdf SHA-256: 3aff406e545d89159286d50d6086207afb15cd4fe31ad2dfbb7f8f9bf111fe69
136 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. A heuristic identified an SEO redirector link disguised as a free download lure, pointing to 'https://baarspo.ru/wix?keyword=cougar+golf+clubs+second+hand'. This suggests the document's primary purpose is to redirect users to a malicious site for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://baarspo.ru/wix?keyword=cougar+golf+clubs+second+hand PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4378605/normal_60025b285558b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488555/normal_5fffb226d4664.pdfIn PDF document text
    • http://stc-l.ru/23151287330b9kil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404975/normal_5fdc886a0a6cf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409405/normal_5febf09d05e95.pdfIn PDF document text
    • http://kersita.space/warhammer_age_of_sigmar_realm_war_app_storem19oe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465123/normal_5feb7e3e269a9.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/fapaga/hard_multiplication_worksheets_4th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/kexamoxusinixu/16093924572.pdfIn PDF document text
    • http://vudagolefedofa.epizy.com/9172053502.pdfIn PDF document text
    • https://s3.amazonaws.com/sepawi/enga_karuppasamy_song_ringtone.pdfIn PDF document text
    • https://s3.amazonaws.com/jovekus/vudosis.pdfIn PDF document text
    • http://sojisij.epizy.com/98753206662.pdfIn PDF document text
    • https://s3.amazonaws.com/memobofilenabon/informant_app_notification.pdfIn PDF document text
    • https://s3.amazonaws.com/loxopudizus/13809286621.pdfIn PDF document text
    • http://ravakalamixalu.epizy.com/guidelines_for_administering_pneumonia_vaccine.pdfIn PDF document text
    • https://s3.amazonaws.com/vavale/71459624802.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_off0000cd60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD60 5328 bytes
SHA-256: 199f5df9e9084659594748ae1f68f26b03fd71f3efdf6ce7c69be266606afdfa
font_01_sfnt_off0000df73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF73 10428 bytes
SHA-256: 5e0fd9180bb87a1ddbbe3bfea77375d495aca594d21a0433d3a6d600b6745546

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