Malicious PDF — malware analysis report

Static analysis result for SHA-256 317ad74616c573bc…

MALICIOUS

PDF

69.1 KB Created: 2021-02-12 14:40:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 31950ab288142dd00470e9e7d8c6d8d1 SHA-1: 912db7e2b0e6851d26be0c8f15e5c3c11d3f632f SHA-256: 317ad74616c573bc3378c92353f7e18a033af1f8f6281ac6ebce14f4e82473a4
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/wix?keyword=yertle+the+turtle+lyrics PDF link annotation
    • https://cdn.sqhk.co/zisubiziwu/IieT4hf/pogijufegataxakono.pdfIn PDF document text
    • http://megatorg.ru/repivodaviruvapurel0g5vc.pdfIn PDF document text
    • http://vizit.store/byousoku_5_centimeter_sub_indo_1080pcc9jo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369802/normal_6018d77bcafad.pdfIn PDF document text
    • http://esmoney.site/the_hidden_shrine_of_tamoachantpjwf.pdfIn PDF document text
    • http://mikrotikwizard.com/azar_application_freeheeyd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501380/normal_5fd083cb55236.pdfIn PDF document text
    • http://submonster.xyz/pokemon_insurgence_item_ido69z0.pdfIn PDF document text
    • https://cdn.sqhk.co/tategupet/hhhgfjd/54646604998.pdfIn PDF document text
    • http://good-production18.site/86291250704bcb41.pdfIn PDF document text
    • https://cdn.sqhk.co/jisofoxabap/geZ6Ygh/rivokukunotidiwaxebedu.pdfIn PDF document text
    • https://cdn.sqhk.co/refowofiros/igAhiTt/soxupopowoja.pdfIn PDF document text
    • https://cdn.sqhk.co/panajevem/jhgiAVS/ear_wax_removal_clinic_melbourne.pdfIn PDF document text
    • https://cdn.sqhk.co/zixapegof/hhQgjjd/vertical_climbing_machine_muscles_worked.pdfIn PDF document text
    • http://idealicaitalia-official.site/loxusabexulabavabatiwezev7gnh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414153/normal_601911e6a9618.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD589 4740 bytes
SHA-256: fedaccec614de7594049739af31f7149439f2f55e5c78496f9f1ae3f91dfc2ff
font_01_sfnt_off0000e5af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AF 9952 bytes
SHA-256: 309a812b37b056b713777310ba499d8f2582c94d075fd14cae06c19370346998

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