Malicious PDF — malware analysis report

Static analysis result for SHA-256 97a91dc31b91f2bc…

MALICIOUS

PDF

65.8 KB Created: 2021-01-29 02:50:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 471c63c83e15cfaa0f2838baa77e887c SHA-1: f29d2c4e005fc9c04ff24ebfe3e25e8198d3c147 SHA-256: 97a91dc31b91f2bca3e28d1d6008671b6f4b5a5fea4038b2b2319f911e95c029
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a significant number of embedded URLs, with several pointing to known malicious redirectors or potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a large link farm suggests an attempt to lure users to external sites, likely for phishing or malware delivery.

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
  • 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://crophysi.ru/123?utm_term=edgit+pro+echo In PDF document text
    • http://wordsidepost.top/pawaxofuwivovamel6pjr.pdfIn PDF document text
    • https://dudunetexuzo.weebly.com/uploads/1/3/1/3/131379759/kotisifadapop.pdfIn PDF document text
    • http://onlinekartiadesi.com/tozorarimomepotorukujiwijqh9jz.pdfIn PDF document text
    • http://instacopyrightcenter.com/best_netflix_movies_2020_canadagfw5v.pdfIn PDF document text
    • https://cdn.sqhk.co/xovujiroveg/eZhbrm7/39423608109.pdfIn PDF document text
    • http://madamzero.com/601209830354w7i2.pdfIn PDF document text
    • http://vamoktin.ru/49382662935q5b27.pdfIn PDF document text
    • http://prodive.su/three_mistakes_of_my_life_in_hinzerof.pdfIn PDF document text
    • http://arendagg.xyz/xesilirudewegabexdckke.pdfIn PDF document text
    • http://playmarket-online.com/zoputukukukevobojehudnw.pdfIn PDF document text
    • http://detonic-ordina.website/vifudi7kyj.pdfIn PDF document text
    • http://0fruit.space/dinosaurs_vs_aliens_filmavpva.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/kudowo/82297151495.pdfIn PDF document text
    • https://s3.amazonaws.com/satulibaren/mugapazazemopevi.pdfIn PDF document text
    • https://s3.amazonaws.com/vonusirukete/sikh_minority_scholarship_form_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/lixasifasi/greenly_beach_surf_report.pdfIn PDF document text
    • https://s3.amazonaws.com/labitajaxatufib/30157379922.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB992 4552 bytes
SHA-256: cfe5a47bfb81bac804452f708574b060e2ac4a61ed2d0759bb39eb605c566c16
font_01_sfnt_off0000c924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC924 9868 bytes
SHA-256: 08c329ae2e037c38bb9a3b29bf6f6ee1fa414e1ae64fd324220659732d9219bf
font_02_sfnt_off0000eaf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF0 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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