Malicious PDF — malware analysis report

Static analysis result for SHA-256 63cf9e857b3c2dbb…

MALICIOUS

PDF

73.8 KB Created: 2021-03-29 20:21:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7dce56e0696c04cb9b7561683f952ad6 SHA-1: b2957d1a546aba653318ea9dfa1acbadf4cde998 SHA-256: 63cf9e857b3c2dbb61357c1ab0ad5b384c4f05e865413f6696ab6b4e9a954658
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, forming a link farm, and is flagged by ClamAV as a phishing trojan. The ML classifier also strongly indicates maliciousness. The presence of multiple external links suggests an attempt to redirect the user to malicious sites, likely for malware distribution or phishing, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://kuzutuzo.ru/wix?keyword=bats+comprehension+worksheets
    • https://cdn.sqhk.co/ranetixeba/bjhjdYL/xowuvirorulavipo.pdf
    • http://felagem.getenjoyment.net/employment_letter_for_visa.pdf
    • https://koduvorubosu.weebly.com/uploads/1/3/4/7/134719400/4840638.pdf
    • https://wujatukeki.weebly.com/uploads/1/3/1/8/131856991/8867955.pdf
    • https://cdn.sqhk.co/xumesapaxoku/Sicid43/freedom_of_religion_clause.pdf
    • https://jukikekiku.weebly.com/uploads/1/3/1/4/131453151/luririt.pdf
    • https://cdn.sqhk.co/rozopebak/dghjgi1/jotidukolekafewosogilinit.pdf
    • https://butemupow.weebly.com/uploads/1/3/5/3/135338881/kuwasixitojedosejev.pdf
    • http://gexopidikimo.mygamesonline.org/68745167213.pdf
    • https://cdn.sqhk.co/tunuravaxoxi/hijhghh/75436705149.pdf
    • https://xukizawumu.weebly.com/uploads/1/3/1/3/131380236/mazogiretofi.pdf
    • http://veviwumifuvemuz.mypressonline.com/what_is_another_word_for_all_the_best.pdf
    • https://cdn.sqhk.co/vakolitakap/tgcQhaB/origami_star_3d.pdf
    • https://wajigigo.weebly.com/uploads/1/3/4/5/134588105/4574e630c8d.pdf
    • https://zefugomifavo.weebly.com/uploads/1/3/6/0/136087281/nomamuvufi_nujukowunomeb_bizupalurovuzu.pdf
    • https://cdn.sqhk.co/sevijeruba/ghwxiaq/horizon_zero_dawn_photo_mode_contest.pdf
    • https://cdn.sqhk.co/mikakiraw/idu0ghg/kalilenimaniradi.pdf
    • http://funasowuto.getenjoyment.net/87452834009.pdf
    • http://xexejevun.medianewsonline.com/gilud.pdf
    • https://cdn.sqhk.co/busanurutar/eE8LFha/mumbai_university_engineering_hall_ticket.pdf
    • https://sukizasatesez.weebly.com/uploads/1/3/4/6/134686833/9256526.pdf
    • https://mijibetifud.weebly.com/uploads/1/3/4/6/134653630/xewoxuze-diwojakurefinit-disubul.pdf
    • http://mozobadijoba.medianewsonline.com/animals_names_list_in_english.pdf
    • https://pudonaneguk.weebly.com/uploads/1/3/4/7/134767047/33e72689f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://vawivulumekil.onlinewebshop.net/fusionner_deux.pdf
    • http://tirisesu.onlinewebshop.net/fundamentals_of_geotechnical_engineering_braja_m_das.pdf
    • http://ledufowi.myartsonline.com/pathology_review_book.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d63c.bin
d59736ef1c6f5254d66ec03a0248637229f015936d1bc23a7cdc747fe2e9bcc6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD63C 5132 bytes
font_01_sfnt_off0000e78a.bin
51575e7335c9038a3bdb5bc36f6f29fc7a62b720ce28d444f4601b380f012bd2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE78A 10484 bytes
font_02_sfnt_off00010b64.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B64 4324 bytes

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