Malicious PDF — malware analysis report

Static analysis result for SHA-256 82959b4a9e966efa…

MALICIOUS

PDF

73.4 KB Created: 2021-05-30 02:44:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 774cc4ac3cdcfe50b5f734e06bbc7480 SHA-1: 5168205828bf614800a541272a1045b85a34995d SHA-256: 82959b4a9e966efa6238d43b950ffac81ccd9dbe217d8dd01807dffe09f29a75
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9997

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://dafemum.ru/strik?utm_term=drawing+app+free+download+for+android PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4443617/normal_5fcbf6326263b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369769/normal_60438902ddb5d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427293/normal_5fda96d81d64d.pdfIn PDF document text
    • https://gomejewenikugi.weebly.com/uploads/1/3/4/8/134869664/rokulufa_fulovisowe_wirapon_senejagoz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375093/normal_5fd83e8495a22.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4412758/normal_60b2b38b4c49a.pdfIn PDF document text
    • https://rajerese.weebly.com/uploads/1/3/4/3/134387708/6143198.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465263/normal_6021672623ef3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461202/normal_5fe194d6e0d07.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/92600eb0-ac2d-4ea4-b84a-ef827ad8bbee/why_do_i_suddenly_have_a_bald_spot_on_my_head.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63e4a1df-6201-4ff1-994d-18b04781a093/audi_a3_1.6_radiator_removal_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b41b1f95-bb44-4506-9a28-6d9635f6831b/50493528614.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ef1557c-40a7-4104-afdf-737e89a20d1c/microsoft_visual_studio_2015_redistributable_runtime_library.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/226ba094-9b1d-4f33-92fd-6f0df8831ca6/the_new_national_baptist_hymnal_articles_of_faith.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de01c136-c678-4be8-81e4-cfd905481dc1/5994718519.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_off0000e322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE322 5124 bytes
SHA-256: 2193d48cbe12836441d6a0c2272cd8ea3309a7249c3098e90e533cec20a5f8ac
font_01_sfnt_off0000f4bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BC 10548 bytes
SHA-256: 4c6762cfabf456835d15a1df47f7feb0262560839ff5b014ee1d41bb24a60b58

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