Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ca5d91a94206c49…

MALICIOUS

PDF

80.6 KB Created: 2021-03-20 06:26:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e4edc4d59046d37d7450417fd912337e SHA-1: 82e53cafec07a661e992172ef6483e41a4afb5bb SHA-256: 8ca5d91a94206c496436e102094e8c5bbb5de3b1a32658570b4f575026b9e955
156 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many pointing to Weebly-hosted PDFs with generated-looking slugs, indicative of a link farm or SEO abuse. One of the embedded URIs, 'https://jumiwimov.ru/wix?keyword=minds+on+physics+mops+answers', suggests a lure to a malicious website. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to a site that serves further malicious content or phishing pages.

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-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://jumiwimov.ru/wix?keyword=minds+on+physics+mops+answers
    • https://vazewelekataba.weebly.com/uploads/1/3/1/6/131606588/bupifixubi_jurunitolulez_muropuxamaf_bixuzu.pdf
    • https://derovidexaw.weebly.com/uploads/1/3/1/3/131382126/texebijosimunid_larefalinefapul_majome.pdf
    • http://jivopifavu.22web.org/81742515253.pdf
    • https://wezusutuxalik.weebly.com/uploads/1/3/1/6/131637092/guzubolalovuxeri.pdf
    • https://getazaxebu.weebly.com/uploads/1/3/4/8/134866961/xapuko.pdf
    • https://purusexubike.weebly.com/uploads/1/3/4/0/134000510/japemer-vejozejinupivo.pdf
    • http://wifejopoxakobo.iblogger.org/yuumi_guide_to_meditation.pdf
    • https://cdn-cms.f-static.net/uploads/4416671/normal_6024f42d786f6.pdf
    • http://gudibetujem.iblogger.org/lifofak.pdf
    • http://pshcomonhere.xyz/what_is_the_exact_value_of_cos_180l58sz.pdf
    • http://bullbananavannaone.xyz/16253323325m76ac.pdf
    • https://cdn-cms.f-static.net/uploads/4366984/normal_5fd8c67f8a1af.pdf
    • http://mnogolidov.xyz/fojusokugurowexevankwp8a.pdf
    • http://diniwesavaku.iblogger.org/tosafiwuxukobumi.pdf
    • http://citrus-fruit.space/jasik9ioww.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sefabe/94039865510.pdf
    • https://s3.amazonaws.com/nuselufuzo/brave_movie_in_tamil.pdf
    • https://s3.amazonaws.com/tolivajupeku/27784818686.pdf
    • http://vetizonudaxow.epizy.com/dazowovabikadebifexupot.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e62b.bin
91cb5fba9ea4197c078b08151e3c4b9f6900a57416b9dc219c9faceba524e15a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE62B 5480 bytes
font_01_sfnt_off0000f8c9.bin
c006df05fa9bb76187d3e67ab2be3b11818e47939220f002a781a8d52b1731c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C9 10764 bytes
font_02_sfnt_off00011d8e.bin
4de993fdf65467371df45ae604b44199a0f9db96dd1987693d1d6f13b22e4334		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D8E 16428 bytes

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