Malicious PDF — malware analysis report

Static analysis result for SHA-256 ace7b34dde8486d6…

MALICIOUS

PDF

69.6 KB Created: 2021-05-04 19:24:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 95879a7cd2e508ad1cf519c595d26cd9 SHA-1: 7cd06c924c0ba006987eeba0deccf9cc31594332 SHA-256: ace7b34dde8486d64dd6eb264b0e49c084f7e99a034719e0932e7146a637a591
214 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to redirector infrastructure or link farms. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' indicates that at least one URL leads to known malicious infrastructure. The ML classifier also flagged this PDF with high confidence. No scripts were extracted, but the presence of numerous external links suggests an attempt to direct users to malicious content, likely 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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=how+to+use+braun+thermoscan+ear+thermometer+with+exactemp+technology In PDF document text
    • https://cdn.sqhk.co/zaviresodew/w0jcL41/balling_eyes_out_meaning.pdfIn PDF document text
    • https://ruxikikigiligex.weebly.com/uploads/1/3/4/3/134347308/168163e912f0.pdfIn PDF document text
    • https://cdn.sqhk.co/pivugisaxap/dwggick/wales_v_western_samoa_rugby_league_1995.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459466/normal_6003b467bc98c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410727/normal_5ff4eaafcbb75.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457838/normal_600a4a2571477.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425256/normal_5fd0477c8aef3.pdfIn PDF document text
    • http://creditactive.info/lg_v30_stuck_on_verizon_screennmm3y.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500446/normal_5fcf0bb8cf8f7.pdfIn PDF document text
    • http://tesocoin.online/543007085490h9q4.pdfIn PDF document text
    • https://xisubuto.weebly.com/uploads/1/3/1/3/131380177/gifepiludowotu.pdfIn PDF document text
    • https://subarijarasojud.weebly.com/uploads/1/3/4/3/134332778/nizase-pifemowazunaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496582/normal_5fdbde13c6509.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416490/normal_606cd616c7ea0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xesovukefezusag.rf.gd/56500101159.pdfIn PDF document text
    • http://giwinilugo.epizy.com/91761144330.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_off0000cfc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC3 5708 bytes
SHA-256: 2c5315f3769bbd6926269c1a345f74f0666bf45763aa1028b912e5296ebb82c5
font_01_sfnt_off0000e31b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31B 11280 bytes
SHA-256: 30dda08f5e90b091f61dc73fe0171ea9005dd2292339232ff28fe5c7c9b9911e

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