Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddea96b9e1827389…

MALICIOUS

PDF

72.4 KB Created: 2020-12-24 04:24:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e8ce0987560bd297c6bfa1cfa2b57161 SHA-1: d7146512b26a6f232a86f60f3bd5fb894a87656e SHA-256: ddea96b9e18273892a5242fa0699485746a4d581621edb5639e76346ae7173b6
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many of which are likely part of a link farm designed to direct users to malicious or phishing sites. The document body, though heavily obfuscated, suggests a lure related to 'African short hairstyles 2019 female' to entice clicks on these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffi.ru/strik?utm_term=african+short+hairstyles+2019+female
    • https://static.s123-cdn-static.com/uploads/4408588/normal_5fc697864222e.pdf
    • https://jomigotub.weebly.com/uploads/1/3/4/7/134748998/2809613.pdf
    • https://cdn-cms.f-static.net/uploads/4478923/normal_5fba2666d05d7.pdf
    • https://cdn.sqhk.co/netesatova/Pjf4xAz/freemeteo_patra_tora.pdf
    • https://static.s123-cdn-static.com/uploads/4413016/normal_5fe07014593c6.pdf
    • https://cdn.sqhk.co/muzexeragod/heigk9t/virtual_pregnant_mom_family_simulator_mod_apk.pdf
    • https://cdn-cms.f-static.net/uploads/4366632/normal_5f87a52c1ce86.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wovigebi/gajojawud.pdf
    • https://s3.amazonaws.com/pusixa/98754222969.pdf
    • https://s3.amazonaws.com/gitipelut/nikon_d3400_user_manual.pdf
    • https://s3.amazonaws.com/zagubip/kowajowulepodatuni.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc6f.bin
2cbc64973a232c6bf536b427bb7ea5400e3887425032bdf391a92eb75e98c3a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC6F 5692 bytes
font_01_sfnt_off0000efb0.bin
0a2422dba295519378fd4dfca44a58a0a700da005f5c39cc7ffab5d6efa5384d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB0 11328 bytes

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