Malicious PDF — malware analysis report

Static analysis result for SHA-256 11fabafa9adeb74c…

MALICIOUS

PDF

67.8 KB Created: 2021-02-23 07:47:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0f9cb625eb76c75e6c277ba3a32f5360 SHA-1: 4d4ca58ffa63c03bdee986d8ca50901d3022e582 SHA-256: 11fabafa9adeb74c79e89bb6123f7366db28d6075164fc5203694b172f461458
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous URLs point towards an attempt to redirect users to potentially harmful content.

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://maypoin.ru/wix?keyword=robot+wants+puppy+kongregate
    • http://mklhhhh.space/dachshund_mixed_with_pomeraniandywcl.pdf
    • http://songkfrk.site/vujukigajawamenuwadwqc9a.pdf
    • http://dsv-trening.ru/zewolojinanubonezudinf0si5.pdf
    • http://legionmone.xyz/bharathiyar_songs_lyrics_in_tamil5pvgh.pdf
    • https://dosaremuxabibi.weebly.com/uploads/1/3/0/7/130739916/tusapet.pdf
    • http://creditscoretracking.info/kusodokidudapufatemisunrlz53.pdf
    • http://merovew.xyz/derivation_of_ellipse_equation7h7z7.pdf
    • http://cg-designer.xyz/ximederb9fre.pdf
    • https://menudobuwowewil.weebly.com/uploads/1/3/4/7/134765252/3e71b991aa2fe4.pdf
    • https://buweselaxe.weebly.com/uploads/1/3/0/9/130969446/3144117.pdf
    • http://am-sound.ru/unifi_uap-_ac-_lr_softwareifwbv.pdf
    • http://dvestideyli.xyz/survival_servers_ark_settingssb3x6.pdf
    • https://vutajavegev.weebly.com/uploads/1/3/4/0/134040502/rafale.pdf
    • https://xatuguje.weebly.com/uploads/1/3/1/8/131856293/vivorojelezirawodud.pdf
    • http://im-marceting.site/34779949058gwr5i.pdf
    • https://sanevofodi.weebly.com/uploads/1/3/0/9/130969150/gomopagugolus-nigudanaxas.pdf
    • http://ifeelgood.club/wutomapivalurilinupat4hf3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000c653.bin
57b4a73730e7e14950a4ec1d889d03e9837d53784285c332c36f9fdacd2d540c
pdf-font-stream PDF embedded font (sfnt) at offset 0xC653 5360 bytes
font_01_sfnt_off0000d8bf.bin
fd5c6d61236f9fbc470fd0d3aee820eb7cd8275247b3fd88fd3a7a82df6f0486
pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BF 13372 bytes