Malicious PDF — malware analysis report

Static analysis result for SHA-256 3834e99cb3f5bce8…

MALICIOUS

PDF

80.0 KB Created: 2021-04-30 11:03:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 1a6147a64ba427f9a756051c7d71fd68 SHA-1: 5708d49eaa483b730fc011efae94b894e826e1a3 SHA-256: 3834e99cb3f5bce8384a12b5b6d58e0a3db7c05b1408a768f441758f84e925a0
156 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 0.9994

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://resalured.ru/strik?utm_term=36+questions+to+fall+in+love+list PDF link annotation
    • https://dozumudokasalog.weebly.com/uploads/1/3/4/9/134902229/kotiro.pdfIn PDF document text
    • https://ginugifugebiner.weebly.com/uploads/1/3/4/2/134234672/632333.pdfIn PDF document text
    • http://pofitasexa.iblogger.org/bigo_live_apk_jio.pdfIn PDF document text
    • https://lepabamun.weebly.com/uploads/1/3/1/6/131636917/8627210.pdfIn PDF document text
    • http://dvestideyli.xyz/how_to_uninstall_deep_freeze_standardua1um.pdfIn PDF document text
    • http://air-calm2.club/best_arabic_textbook_for_beginnerstdo2x.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://43e59f28-96d7-4988-bcd6-55bc25f76e69.filesusr.com/ugd/372bdc_e6d4af2f4f234457abea731ca19f6858.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/donukadizolin/jaxagakavisozirufi.pdfIn PDF document text
    • https://s3.amazonaws.com/zuses/financial_accounting_information_systems.pdfIn PDF document text
    • https://6db1e9a2-4282-4636-8d41-de07325ad911.filesusr.com/ugd/d97b38_0ebfe11ebda448e5860b758caeb58236.pdf?index=trueIn PDF document text
    • https://6196a4e6-b3b5-4a85-a139-4ec84e0a53d9.filesusr.com/ugd/d01287_ed296cba1a444876ba10d1d4a12467cd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/radubozufiwo/bash_script_parameters_from_command_line.pdfIn PDF document text
    • https://9305c775-266c-4126-9ef9-90a5cffee957.filesusr.com/ugd/c3f88d_754c75154103424dae617733656d6d5d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lomogas/how_to_use_bostitch_sb-1664fn.pdfIn PDF document text
    • http://rawuvotatu.rf.gd/how_much_does_chick_fil_a_store_manager_make.pdfIn PDF document text
    • https://28932ed2-21d9-4123-99cb-fcff0aac4472.filesusr.com/ugd/cc089a_6b077ff6046d40659774b9f086c5eaa5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jepinebawo/what_is_the_device_used_for_morse_code.pdfIn PDF document text
    • https://03ca3561-abfe-48ca-9b59-b1b2b77f8126.filesusr.com/ugd/1af49e_90e1ca41ccbd4b6e96968092c054412e.pdf?index=trueIn PDF document text
    • https://18574fdc-dbe8-4f24-a3f7-ab3d6ff540e7.filesusr.com/ugd/d45bfa_52d680ccaad34464b07905afb9fc662a.pdf?index=trueIn PDF document text
    • https://f8bd9030-4518-40b4-9047-d478e6ffc17b.filesusr.com/ugd/608fe2_5a12f5013ee0457a9347eb4d4a51d5dc.pdf?index=trueIn PDF document text
    • https://a001dc82-f31e-4944-9b76-0a8e602b6855.filesusr.com/ugd/e4ee87_afe52a1911dc42e6bcaa55664c5fe91e.pdf?index=trueIn PDF document text
    • http://nevejekegasa.epizy.com/nipagakololalenimal.pdfIn PDF document text
    • https://9d50af6f-dbf7-41ba-b854-83985329a12b.filesusr.com/ugd/33c377_546f8e183fb24536af4e685234029722.pdf?index=trueIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBEA 5072 bytes
SHA-256: 855f45c6f623ad19e336bacf33043f3b2de00ade8a36674eea32e9acd47aead1
font_01_sfnt_off00010d4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4B 11112 bytes
SHA-256: d81e7c975f83daa42016e009018dc45e3722d7717610642ad6c732ce6cde71d2

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