Malicious PDF — malware analysis report

Static analysis result for SHA-256 923f3a276bb0abb7…

MALICIOUS

PDF

79.4 KB Created: 2021-03-09 11:20:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 7d666772e2528356039266b75cc6d07e SHA-1: 2985b7773e9fe885d7d13f1b295f5b98f87f57be SHA-256: 923f3a276bb0abb74cf5ebb899d60996db90f761f5c43342560ae98fa828300c
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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jottigo.ru/award?keyword=rachmaninoff+elegie+pdf PDF link annotation
    • http://com-connexion.xyz/kawitwzr1l.pdfIn PDF document text
    • http://re-capital.ru/66233752479yl1ki.pdfIn PDF document text
    • http://creditscoretracking.info/chicco_bravo_trio_system_with_keyfit_30_infant_car_seat_review01p4h.pdfIn PDF document text
    • http://boevoenlp.com/how_to_change_battery_on_ipod_touch_4th_genqr0uu.pdfIn PDF document text
    • http://3203epworthcres.com/931620023507jmzw.pdfIn PDF document text
    • http://sale-siberian-force.online/36205135601niji7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489440/normal_602ed3f29cb2c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422148/normal_6022baa21c244.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://45ae50e1-98a8-4501-9ad6-fc0df438eb43.filesusr.com/ugd/b16523_04eb82a0b8254c3ca5cc0d30617cb645.pdf?index=trueIn PDF document text
    • https://86908e24-11f3-43a1-9346-bf531f45ee0b.filesusr.com/ugd/97493d_c6c81ec81db54f75baf332c0a6125762.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vibuvomomuv/check_self_permission_android_fragment.pdfIn PDF document text
    • https://s3.amazonaws.com/pevarijidasalop/rugakavozide.pdfIn PDF document text
    • https://s3.amazonaws.com/mejigavukolu/define_community_relations.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_off0000e5f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F8 5300 bytes
SHA-256: e711bf166f5126136b9162bee60439eb546f19e6aa7acf03b9bcb356b3caa932
font_01_sfnt_off0000f7e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E5 10360 bytes
SHA-256: 59137c53a8e510462c56dd2326cce49f22c3aceb4495049b86f9689c466d8c90
font_02_sfnt_off00011b9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B9A 16120 bytes
SHA-256: 15a68420f1c377824b8c1fd571ac7c30556db1b4bc05006bf44ec3f6c6c83208

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