Malicious PDF — malware analysis report

Static analysis result for SHA-256 f47572a1aca7d5d9…

MALICIOUS

PDF

72.0 KB Created: 2021-02-28 21:34:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 209ee3a1469b36c46a63aacf19191152 SHA-1: 0dea53a17f215959f582fb8220d6a1d075b0ee17 SHA-256: f47572a1aca7d5d96b9e926694415849090203318c55aa694ba222af61931269
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of external URIs and the nature of the heuristics point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://soxebez.ru/strik?utm_term=brother+hl2170w+network+setup PDF link annotation
    • https://wotuterivakevom.weebly.com/uploads/1/3/4/6/134608936/3169666.pdfIn PDF document text
    • https://cdn.sqhk.co/raxuzuvuluf/xXhjgej/40275706865.pdfIn PDF document text
    • https://cdn.sqhk.co/lebogomatoze/jKjfidg/tobotav.pdfIn PDF document text
    • https://cdn.sqhk.co/nugizape/jgdb4fE/anime_live_wallpaper_hd_for_android.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449996/normal_6003ea6d0634b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384828/normal_601feeaedb776.pdfIn PDF document text
    • https://cdn.sqhk.co/viwiratoposu/5tjeAUo/pokerstars_mixed_games.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480580/normal_5fccb7c1731dc.pdfIn PDF document text
    • https://pipenibeteza.weebly.com/uploads/1/3/4/5/134508730/gizawilizaleva.pdfIn PDF document text
    • https://cdn.sqhk.co/famazipow/jdjb1ic/anti_theft_alarm_for_bike_price.pdfIn PDF document text
    • https://cdn.sqhk.co/xolanikipiz/b4ggnif/23329174427.pdfIn PDF document text
    • https://sawifumoz.weebly.com/uploads/1/3/1/3/131380604/tupixovazam-sibef-wowalixuravegu.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/bomupi/marvel_strike_force_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/difigomisosak/lisabedojutogal.pdfIn PDF document text
    • https://s3.amazonaws.com/vasofirida/94267415172.pdfIn PDF document text
    • https://s3.amazonaws.com/juvuraguvutoxif/70687458934.pdfIn PDF document text
    • https://s3.amazonaws.com/somisilegex/33644745405.pdfIn PDF document text
    • https://s3.amazonaws.com/savifin/arcview_gis_3._3_free_software.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_off0000dd0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0A 5308 bytes
SHA-256: 76f4180ba7696971b29e11d6ad816aefae677917c179036c26640c6c0054363c
font_01_sfnt_off0000ef37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF37 10584 bytes
SHA-256: a0d2238f3c254c10e4e6e76db19cab56992b2e88200aa30e9b7b99ad381791cb

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