Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed15e4ea9053f113…

MALICIOUS

PDF

106.9 KB Created: 2021-03-27 10:30:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 917b64d6d71475e21a349c79f7845576 SHA-1: 27ae3ab469bab2d80e3b2680ceae8afd30b2d355 SHA-256: ed15e4ea9053f1135308010a50176a0afdee5208540c4029407226a5ee446e27
156 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many of which are numeric slugs pointing to potentially malicious domains, indicating a link farm for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as Pdf.Phishing.Trojan. The embedded URLs, such as 'https://lozipotod.ru/123?utm_term=bumblebee+2018+soundtrack' and 'http://kvyovk.xyz/40757782901i904s.pdf', are key indicators of this malicious activity.

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://lozipotod.ru/123?utm_term=bumblebee+2018+soundtrack
    • http://kvyovk.xyz/40757782901i904s.pdf
    • https://cdn.sqhk.co/zebenane/hiedA7w/wukegesaxoburoj.pdf
    • https://cdn.sqhk.co/vuramufef/Yohgiec/80335301740.pdf
    • http://driveformclanemilwaukee.com/3718820635xquiy.pdf
    • https://cdn.sqhk.co/bikulatitaxe/mREcAeD/dstv_compact_channels_tv_guide.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://8d90b851-447f-4cfc-ac95-1e867b71b983.filesusr.com/ugd/b371d9_437dab125a9840cda88a2e04bf9c44b7.pdf?index=true
    • https://8eefcaf3-52f5-4123-8be5-b1f0aaeea45e.filesusr.com/ugd/1d3654_ed447f5ad1ac4380b949d707283ae0af.pdf?index=true
    • https://s3.amazonaws.com/vikukinumet/jopodoforawavapolotazuf.pdf
    • https://s3.amazonaws.com/lofese/wabidobisimiwip.pdf
    • https://s3.amazonaws.com/veraxawewib/have_got_has_got_worksheets_for_beginners.pdf
    • https://s3.amazonaws.com/xakusineba/dhhs_guidelines_cryptococcus.pdf
    • https://s3.amazonaws.com/lolijexejomak/digital_designer_salary_california.pdf
    • https://dfa52777-3edb-460f-9b14-ca5101cd4ecc.filesusr.com/ugd/5360f8_7d01ac5c465b4a25a5d40212044c28ad.pdf?index=true
    • https://s3.amazonaws.com/fujadabez/87989879213.pdf
    • https://db532842-334f-4efb-8993-e67ec8f20ff5.filesusr.com/ugd/bc5be3_fcf622c71c0d4f52b2ed577db55f0106.pdf?index=true
    • https://s3.amazonaws.com/pafiganovavi/adobe_captivate_8_user_guide.pdf
    • https://f1c0478e-57b3-422a-b8eb-433964b677d2.filesusr.com/ugd/16c17d_e77e3a3128f04e7c8aeec76038f2376c.pdf?index=true
    • https://s3.amazonaws.com/vofadoloves/46re_transmission_rebuild_book.pdf
    • https://s3.amazonaws.com/bifadiwuwileji/67490809953.pdf
    • https://be5a03d2-cb36-429a-bb4d-4773f067dd3b.filesusr.com/ugd/b46ca8_12e805c6e6e84105bb2da5ad6e90f7df.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016157.bin
e2c8457bce236198325c422e7d5b5e9a739062a00a149da966f26e2c8477376e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16157 5856 bytes
font_01_sfnt_off00017531.bin
1207bc92cf53a0d2e744d0631dfcc9129fd2b6b4a0504d2964b11a29a9562dba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17531 11884 bytes

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