Malicious PDF — malware analysis report

Static analysis result for SHA-256 c23144ab0cfc0ef8…

MALICIOUS

PDF

73.4 KB Created: 2021-04-17 05:42:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 866dcf7aed16c4d49b0b1aa2b53bf742 SHA-1: 74356e9a9bceab1d3006b026ad632ad770ef9558 SHA-256: c23144ab0cfc0ef8809abdc128c497409813cb4a720a86a5a42a7d469139940f
156 Risk Score

Malware Insights

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

This PDF document is identified as malicious by multiple heuristics and a machine learning classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting it is part of a link farm designed to direct users to potentially harmful websites, such as the one at 'https://jumiwimov.ru/strik?utm_term=pals+breakfast+menu+prices'. The document body, though truncated, appears to contain metadata related to its creation, but no explicit user-facing content that would explain the lure. The presence of PDF-specific heuristics like 'PDF_SEO_LINK_FARM' strongly suggests a phishing or malware distribution campaign.

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://jumiwimov.ru/strik?utm_term=pals+breakfast+menu+prices
    • http://zokasup.22web.org/mv_btob_beautiful_pain_720p.pdf
    • https://runigofotizete.weebly.com/uploads/1/3/4/4/134433234/51ac283c0.pdf
    • https://cdn.sqhk.co/mivesumor/JX1hdr8/toggle_free_meaning_in_urdu.pdf
    • https://busaluvugisegiw.weebly.com/uploads/1/3/4/3/134368440/2171791.pdf
    • http://risitolamaxil.22web.org/adobe_reader_free_download_windows_xp.pdf
    • https://fosuwelu.weebly.com/uploads/1/3/2/6/132695698/6982099.pdf
    • http://povar2020.site/2689123401694yfi.pdf
    • https://cdn.sqhk.co/kofatuziwu/eWhfhgp/zafelupuzafu.pdf
    • http://quickpapp.online/242272189546zenc.pdf
    • https://duzuvopewawufos.weebly.com/uploads/1/3/4/4/134491429/guxibonov.pdf
    • http://acupofjacob.com/legal_services_authorities_act_1987hp3j9.pdf
    • https://pepadamive.weebly.com/uploads/1/3/4/4/134468065/biludileranemo-fusumo-risut-fadomas.pdf
    • http://123dutch.com/g_dragon_divina_commedia_mp3_download1rt6e.pdf
    • http://wapajag.22web.org/illustrated_encyclopedia_of_world_history.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wujikefixazoni.epizy.com/26097468775.pdf
    • https://562c2315-396f-49d1-9e45-1236e049cb13.filesusr.com/ugd/ec0012_e4f7eef4949a4135840db63a466c6abe.pdf?index=true
    • https://21319658-e817-4d6a-846f-872ccfe0f0c2.filesusr.com/ugd/982af2_f221607eaeb44417a91c305dd971e474.pdf?index=true
    • http://vapuzinejag.rf.gd/how_to_pass_the_mississippi_permit_test.pdf
    • http://numapev.rf.gd/34877108770.pdf
    • https://cff07a16-13b2-455b-8a78-148a75b158b4.filesusr.com/ugd/cda0c7_aa9df2190f1346e590b1b002dd43bce3.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_off0000dda1.bin
783c4081460efee82beafeaa0e18426b73cbe0131cba47818ef6075a8707c5be		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA1 5368 bytes
font_01_sfnt_off0000efce.bin
36d4777628ba8ce3c356c91b9ebc9976718f3237a1ff03353476897f6205ae39		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCE 11724 bytes

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