Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0f497e829807b64…

MALICIOUS

PDF

75.0 KB Created: 2021-06-01 03:19:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 378ecc36a7cd3170953c91ed6ee676bc SHA-1: 74d7fb31071630c718b215abca327b53a43c0592 SHA-256: a0f497e829807b64930cc7ddabcf4918702f8169e95bd324fad2216a8dadf9a6
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on strikinglycdn.com and appear to be part of a link farm designed to attract traffic. One prominent URL, https://nomylo.ru/pbw?utm_term=seetha+kalyana+solo+song+mp3+download, suggests a lure for downloading content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://nomylo.ru/pbw?utm_term=seetha+kalyana+solo+song+mp3+download
    • https://static.s123-cdn-static-d.com/uploads/4467936/normal_60b56853e352f.pdf
    • https://cdn-cms.f-static.net/uploads/4443624/normal_60566d1510607.pdf
    • https://ruxosegid.weebly.com/uploads/1/3/4/2/134265817/a1e2986.pdf
    • https://ruvawigalovenu.weebly.com/uploads/1/3/4/3/134318686/bd86e69f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/8246e81f-0a5a-4e38-8f88-dd1eab000931/xanoletamugomazidarudixam.pdf
    • https://uploads.strikinglycdn.com/files/615b7565-2c98-4c0c-b65d-c5ed443c13f8/mifogavivaxamofisaxabuz.pdf
    • https://uploads.strikinglycdn.com/files/fc3c5415-ad63-4c7f-9d99-402afe0ca87c/64590908141.pdf
    • http://lijegazoz.pbworks.com/w/file/fetch/144416370/4391314096.pdf
    • https://uploads.strikinglycdn.com/files/25eff60b-9ef3-4159-b214-9165f58b3c69/32858665121.pdf
    • https://uploads.strikinglycdn.com/files/68bc3d87-7580-4ecd-a226-019627cea918/how_to_use_a_bartender_kit.pdf
    • http://xawaren.pbworks.com/w/file/fetch/144418629/baofeng_uv-5r_legal_in_india.pdf
    • https://uploads.strikinglycdn.com/files/6f5a4741-47b6-4609-895e-507ebf2b134d/buddhism_for_beginners_thubten_chodron.pdf
    • http://zufumegi.pbworks.com/f/funapupozikunofodidaviwiw.pdf
    • https://uploads.strikinglycdn.com/files/e69915d3-9c04-4760-b62a-3ec7dc93e4c9/what_city_is_love_in_the_time_of_cholera_set.pdf
    • http://xuruzinijub.pbworks.com/w/file/fetch/144429045/shostakovich_waltz_2_sheet_music.pdf
    • http://memofemovo.pbworks.com/f/optavia_dining_out_guide_pf_changs.pdf
    • https://uploads.strikinglycdn.com/files/b9da9bdf-a47e-4ae7-95a4-477be41e4955/corporate_identity_system_cis.pdf
    • https://uploads.strikinglycdn.com/files/11cd095d-d262-4fbd-99a1-55b732817020/how_to_answer_summary_question.pdf
    • https://uploads.strikinglycdn.com/files/1de96757-236c-4918-a418-55b902f37823/dikafufipikizexanogikew.pdf
    • https://uploads.strikinglycdn.com/files/180e6309-4f12-47fa-aad9-26dbc62acf15/how_to_fix_kyocera_printer_offline.pdf
    • https://uploads.strikinglycdn.com/files/3424c536-88be-4f01-b08d-c4f775eacf08/what_is_the_biblical_definition_of_evangelism.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e70e.bin
df29d182cedbd479fd7b8ddde97d2d1a80ba64a0b9aa6ce0fa1d7d42308d73f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE70E 5804 bytes
font_01_sfnt_off0000fac2.bin
984bc7aab399096bdf5b65d378b25ad32e192395eb335a804780982fdbf6d706		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC2 10296 bytes

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