Malicious PDF — malware analysis report

Static analysis result for SHA-256 43d9e6e95b62569a…

MALICIOUS

PDF

96.3 KB Created: 2021-03-17 12:38:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e80abba07ad3f8d3c86c9e08b446aa88 SHA-1: dcee9e7e859db568bdb1fb2c04f5d17c80f561ff SHA-256: 43d9e6e95b62569a66f89bbe5aef6e3813f9d16222c1c348cc0245936006e7a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many of which are to suspicious domains, indicating a link farm or SEO poisoning attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' point towards an attempt to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nipisod.ru/wix?keyword=architectural+lettering+pdf
    • http://copriyghtconfirmed.com/marriage_wishes_images_freex92yg.pdf
    • http://golosa-spasibo.ru/96827653140zocc6.pdf
    • http://olymp-trade.top/fususekozowoke85gn7.pdf
    • http://shopee24.site/xikadubejotekebolojumigop4189j.pdf
    • http://barberking.best/kujolavabekizig5zf3.pdf
    • http://1pokypki.website/sbi_green_card_application_formodf4l.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://8c805f22-5240-4a8e-9b4d-8499607ff1fc.filesusr.com/ugd/76156b_01ec7af31be549a79bdb15ba2cc38ea4.pdf?index=true
    • https://76bf09fe-c378-4d6f-baa9-beaf48595a8b.filesusr.com/ugd/61567a_78a73e51e6ff40edb7a2662c8ed7fe06.pdf?index=true
    • http://japuxizikaroviv.rf.gd/barsaat_1995_full_movie_hd_720p.pdf
    • http://sorotakadu.rf.gd/55231714191.pdf
    • http://tumaxokalabad.epizy.com/adobe_reader_software_for_windows_7_free_download.pdf
    • https://4b4b92a8-4ac5-4030-97d5-af0917f8c077.filesusr.com/ugd/0251f0_a6ef18e02eb14b17b2bd706166de98c4.pdf?index=true
    • http://lexaxixamu.rf.gd/modern_family_season_11_episode_1_script.pdf
    • https://1261df91-4e32-40b2-8b8a-4050d3c54cbb.filesusr.com/ugd/df69c1_63922df0f9124e60bb5b347a1655e219.pdf?index=true
    • http://kalogoraretupo.epizy.com/pumof.pdf
    • https://ced6af22-cf5f-4df0-9cd6-2d424634d287.filesusr.com/ugd/3eed2b_660e807d95a74c5e9fa9df41b1e5e715.pdf?index=true
    • https://684917c6-b594-4497-9ea4-141105166a5b.filesusr.com/ugd/0dc9f5_23a0c88ae1374318b73c316dcc7ab2df.pdf?index=true
    • https://dda5c79a-a75d-44d9-a006-48dec3bfe172.filesusr.com/ugd/115d6e_a836e842398a4f57bc7a2b9d4fb51541.pdf?index=true
    • https://5c817321-7c0c-448b-959d-deb1da9fd788.filesusr.com/ugd/19103d_36c9419eada944e6a91318014cce899d.pdf?index=true
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012e76.bin
2df84a684037e58062d5c9a898aed0ca6509ec50eb07458cc7f8b6d6c175e13b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E76 5000 bytes
font_01_sfnt_off00013f69.bin
476dc6e66149af82a172a1220b2484031afb2804077f2ee2fa7b4b6dd6f096e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13F69 11380 bytes
font_02_sfnt_off000165c0.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x165C0 4324 bytes

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