Malicious PDF — malware analysis report

Static analysis result for SHA-256 275f4fb832c0e419…

MALICIOUS

PDF

82.0 KB Created: 2021-01-08 16:58:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: bbe86a2170776d7c559568fe3c70ab08 SHA-1: 2d537652f8568875b2da0bbae2d9772654344b73 SHA-256: 275f4fb832c0e41950db1428a6f27d9dd1617222e84f05af1dd6418396d6167e
214 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, specifically for containing links to known malicious redirectors and a large number of external PDF links, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection further support its malicious nature. While no scripts were explicitly extracted, the embedded URLs are the primary indicators of malicious intent, likely leading to phishing pages or further malware downloads.

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
  • 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=abs+plastic+material+pdf In PDF document text
    • https://static.s123-cdn-static.com/uploads/4378170/normal_5fc89c4a12f0c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402940/normal_5fcea6f263c44.pdfIn PDF document text
    • https://dujizozobalosu.weebly.com/uploads/1/3/4/4/134470010/9163353.pdfIn PDF document text
    • https://cdn.sqhk.co/pomorezolo/NhhAAcv/64385106726.pdfIn PDF document text
    • https://sojofemek.weebly.com/uploads/1/3/4/3/134310133/90da25f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/53a53d44-0fe7-46bd-a2dc-0d79afb0b124/you_are_beautiful_in_spanish_lyrics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53594f1a-e7a8-4796-8ff4-9becf1e1543b/6216807428.pdfIn PDF document text
    • https://s3.amazonaws.com/moduxanakuri/8521424914.pdfIn PDF document text
    • https://s3.amazonaws.com/fibesezati/vidurawazizamik.pdfIn PDF document text
    • https://s3.amazonaws.com/sefepugolupalax/85394707073.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14d9dd4f-3ff6-4440-b759-f0f58a126a32/neverwinter_scourge_warlock_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcdf4be7-e495-4343-ba58-35d6e9e911fb/vopuxekakejujavalugiwivop.pdfIn PDF document text
    • https://s3.amazonaws.com/xepululejiwof/veeam_backup_software_free.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ece2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE2 5432 bytes
SHA-256: d3e673f65ad0b18806def50acf6ead0a63c40dd2542b518e442456d709b489bd
font_01_sfnt_off0000ff3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3C 11372 bytes
SHA-256: e772c9487cd9f22d269046abdbe7669cf3e242359b0c5e3eddb69328c8c4be35
font_02_sfnt_off00012613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12613 16060 bytes
SHA-256: ae97ebdbf5cb6679ee3ae7f6f8963da9ec2437ada1f672a33085bc8cbe806833

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