Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7e20c37313ae26b…

MALICIOUS

PDF

69.4 KB Created: 2021-03-21 10:41:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 7c5ff770f2fcf09498c20e6c76863c15 SHA-1: 53a3ad2043fdde1ef9eb0838867f29e270abe88e SHA-256: a7e20c37313ae26b16f6178e96de0774f5db85e770f0f52ed98b2ea6a3c0573f
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 0.9998

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://seumenha.ru/strik?utm_term=acls+provider+manual+2018+pdf+free+download PDF link annotation
    • https://gawozigojuvapa.weebly.com/uploads/1/3/4/8/134896601/managejemoduli-tumarixa-forasafuwosur.pdfIn PDF document text
    • http://nafewid.sportsontheweb.net/ap_grama_sachivalayam_preparation_books.pdfIn PDF document text
    • http://fufirewavit.getenjoyment.net/13888805331.pdfIn PDF document text
    • http://wwwbcpzonasegura-viabcp.com/3d_printer_templatesmgnlf.pdfIn PDF document text
    • http://xtw2.club/zasirawigisiwosenopasa3lb3a.pdfIn PDF document text
    • https://wubedekajonew.weebly.com/uploads/1/3/1/3/131380741/e1ade92.pdfIn PDF document text
    • http://marketitaly.info/pioneer_avh-4100nex_screen_replacement0zsvx.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tezude/21_day_sugar_detox_breakfast_ideas.pdfIn PDF document text
    • https://b70645e9-42d7-44c6-80f2-f165c8819e8d.filesusr.com/ugd/3f1130_87a917c808af4d30874c54754c2de3e4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tetofamuxulil/koliruletugabatebava.pdfIn PDF document text
    • https://2e8e3215-33bf-4fe1-bc67-b38dac560527.filesusr.com/ugd/269bb8_f34e30d60ba446408cba0d99fb14d666.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/buwosevax/krups_beertender_b95_for_sale.pdfIn PDF document text
    • https://aefbb2f1-1cfc-4a48-aab2-d72547d84173.filesusr.com/ugd/2f3ac6_e445de646a4a4a0a8cc2eff02d7ebe5f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dugibabafod/digital_literacy_productivity_programs_test_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/kudefem/camtasia_studio_for_windows_10_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jepinebawo/12928711292.pdfIn PDF document text
    • https://s3.amazonaws.com/peveziwoguxuzam/amlin_syndicate_2001_annual_report_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/xetasif/43269121319.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE6D 5960 bytes
SHA-256: ea7c62e7ec33f3c75b8cc1b43f37ee8271f738463efcac864d63d895720dce8b
font_01_sfnt_off0000e2c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C2 10512 bytes
SHA-256: fc383890e7ed1611b5e7ee097a3c2d853e6fb4a3f78ffd06e8850542e95c8552

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