Malicious PDF — malware analysis report

Static analysis result for SHA-256 18cc91d331df52e1…

MALICIOUS

PDF

80.5 KB Created: 2021-03-22 17:02:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: b434d7655a7289e2bdba36afc7b237dc SHA-1: bb701103177665da5012c78d39a407ac57f3f978 SHA-256: 18cc91d331df52e1e545b39ecb491ff1610ab60432c7108fa23fbfb72522f226
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://gimoguvi.ru/123?utm_term=printable+calendar+2018+canada+pdf PDF link annotation
    • http://bonifacy.site/the_crucible_quotation_analysis_study_guide_act_120otq.pdfIn PDF document text
    • http://kupivse.xyz/minajuxereluweq5rt1.pdfIn PDF document text
    • https://cdn.sqhk.co/zimuteraf/WRhdhg5/69070353142.pdfIn PDF document text
    • https://cdn.sqhk.co/xiladuxe/wjbjgic/touch_em_all_joe_quote.pdfIn PDF document text
    • https://cdn.sqhk.co/janonaset/iqxjejh/3563573416.pdfIn PDF document text
    • https://cdn.sqhk.co/rinugezig/Dgd1gdp/42064406783.pdfIn PDF document text
    • https://cdn.sqhk.co/budotedo/MEgh4ic/57878654865.pdfIn PDF document text
    • http://grinallex.shop/1118016625va0zn.pdfIn PDF document text
    • https://vizipelijokefar.weebly.com/uploads/1/3/4/5/134512389/lalexiwimofilan.pdfIn PDF document text
    • http://vinuporabomod.iblogger.org/jojadumegaw.pdfIn PDF document text
    • https://jojomelemotupe.weebly.com/uploads/1/3/5/3/135305357/7084d831515a0.pdfIn PDF document text
    • https://cdn.sqhk.co/fivodewile/hdTsngc/play_run_santa_run_game.pdfIn PDF document text
    • https://cdn.sqhk.co/sadebupunen/ckijHVI/friends_tv_show_wallpapers_desktop.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f9c380c0-3c9a-404e-8c76-a924832b335c.filesusr.com/ugd/9c8fb9_73f0faca2ac5406a923237f136221a87.pdf?index=trueIn PDF document text
    • https://3f740848-0e57-4b51-8596-564812021bec.filesusr.com/ugd/cbe17c_213e6f515d1b4bf7bf49bd473dd5111b.pdf?index=trueIn PDF document text
    • http://kekabipiji.rf.gd/kasabevibuxijuma.pdfIn PDF document text
    • https://ef9935f7-a918-44a1-999f-f1d50a45e4a7.filesusr.com/ugd/b463f2_7b06608a57b64fd0ac17944adbfbe31a.pdf?index=trueIn PDF document text
    • http://sufapanizesemot.epizy.com/army_anti_terrorism_level_1_test_answers.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A8 5632 bytes
SHA-256: 3f619e7fef35a8eee2b1a4e5486f060fffa97416aa8ef5efd497e85d4e43c406
font_01_sfnt_off0000f9de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DE 11268 bytes
SHA-256: b7c1bb740cb91db5c4eb7039f0e290ede58c20c3838cded9d7a136e94c101a8a
font_02_sfnt_off00012009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12009 16108 bytes
SHA-256: 32f4f1f0b695e5d4615fbcad4b5b3a29e2120f680b26ad6392bb678d83ba1141

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