Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9b424ac04d25ceb…

MALICIOUS

PDF

64.4 KB Created: 2021-01-14 04:38:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: d6acfbe748929f992112cd0f18cb839f SHA-1: 86332457b23c5327ae50d0af7e4ae2cabb98e7bf SHA-256: f9b424ac04d25ceba20b0a21df12740fea86cf183f26af181220d6cf9bf77c11
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with heuristics indicating it's a link farm and a redirector to malicious infrastructure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

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://traffine.ru/aws?utm_term=free+email+signature+templates+for+outlook In PDF document text
    • https://static.s123-cdn-static.com/uploads/4379029/normal_5ffd84441d333.pdfIn PDF document text
    • https://cdn.sqhk.co/kapapomabu/Riduihf/xinuve.pdfIn PDF document text
    • https://site-1242757.mozfiles.com/files/1242757/luziw.pdfIn PDF document text
    • https://nufirejibojo.weebly.com/uploads/1/3/4/6/134645492/tokexirovobegu.pdfIn PDF document text
    • https://xurolimusogisuw.weebly.com/uploads/1/3/4/3/134395808/rulusugofus-tovotemekug.pdfIn PDF document text
    • https://vitumiwoz.weebly.com/uploads/1/3/4/6/134697216/44f095.pdfIn PDF document text
    • https://cdn.sqhk.co/pamomusemida/h8ngcic/73594305513.pdfIn PDF document text
    • https://rakulemuvi.weebly.com/uploads/1/3/4/5/134506415/mumopusaveti.pdfIn PDF document text
    • https://fadusoga.weebly.com/uploads/1/3/0/7/130739873/digejinore-jedobasedajes-zowosexikos-pawili.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/xukanomarexumu/50133984257.pdfIn PDF document text
    • https://s3.amazonaws.com/gapivegek/maharshi_audio_songs_please.pdfIn PDF document text
    • https://s3.amazonaws.com/tesodagiwor/barf_si_instrumental_ringtone.pdfIn PDF document text
    • https://s3.amazonaws.com/pusolefosex/bixujadezogidexugit.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_off0000bf31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF31 5240 bytes
SHA-256: 067052a74ee994a04d03a6938232a9bcef38c772997f81c9eb357824841e3ab5
font_01_sfnt_off0000d0ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0EF 10360 bytes
SHA-256: 176166e25bf7b618e9a926a6bda99af1a5b37e2043aafdd322aa071c5ca10161

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