Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d31c8cc0b18756b…

MALICIOUS

PDF

75.9 KB Created: 2021-03-06 19:20:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 0e53bedadf776b6d11a25f20893357a5 SHA-1: b2ce1a8f53db832fc5b9fb88b65433004b37f939 SHA-256: 4d31c8cc0b18756b158ecb5dfb88b6e36c6ad479494f1f9227e91b32be5e3d19
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains embedded URLs that lead to suspicious domains, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is part of a link farm designed to host disposable content, further supporting malicious intent. The ML classifier and ClamAV detection strongly indicate this PDF is malicious, likely serving as a lure to a phishing site.

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 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://golowaki.ru/strik?utm_term=what+is+the+main+idea+of+chapter+1+in+the+giver PDF link annotation
    • http://naturagrush.space/block_out_traffic_noisepbrf0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380882/normal_60368e8e07e5a.pdfIn PDF document text
    • https://cdn.sqhk.co/fokodusi/dMmOAWE/82064054810.pdfIn PDF document text
    • http://olymp-trade.top/coolidge_cricket_ground_antigua_pitch_reportppwoa.pdfIn PDF document text
    • http://mmmmmme.space/epubtvdpe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379841/normal_6025773144850.pdfIn PDF document text
    • https://cdn.sqhk.co/zobazulibes/djeRf2L/genomabegudedisaji.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417997/normal_5ffdc37277392.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406789/normal_5fcb9abf0f02c.pdfIn PDF document text
    • https://cdn.sqhk.co/pixazizaze/hbghwic/34301107504.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/a9f3595b-4e1b-4f2f-a86b-074627da34c7/jbl_xtreme_2_review_techradar.pdfIn PDF document text
    • https://59bb578d-b312-442a-858b-1a1a54b18a6c.filesusr.com/ugd/c79b1c_30cec68c3a1e40b199d0ccf701f06295.pdf?index=trueIn PDF document text
    • https://12f7643e-9106-4823-89c2-0bdaecd1bc22.filesusr.com/ugd/1f6d71_1aeb6edd8c164c8b9961449bf7d7169d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tosego/85306457865.pdfIn PDF document text
    • https://s3.amazonaws.com/vojapu/lagu_birdy_nam_nam_goin_in.pdfIn PDF document text
    • https://5b2b9875-3923-4577-9ef6-0527498c95e7.filesusr.com/ugd/4e6dd5_80ffaa92e860411f8900b9fd11ee0861.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/20643f86-0f9a-4486-a5ae-5133b539a1bf/my_maps_tutorial_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/gogunabones/sekafunogebekisuni.pdfIn PDF document text
    • https://2e8e3215-33bf-4fe1-bc67-b38dac560527.filesusr.com/ugd/269bb8_b618d675306247d6aace79ecb77c4fa4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f1006ce-661f-47af-a14c-aa984d269afb/21312175541.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76479c11-adc6-4af5-82eb-97b0b622c275/33971767755.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_off0000e674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE674 5664 bytes
SHA-256: c6da103095c37147898cad790f51034166a9ed75de995315bdeb0939c5e717b6
font_01_sfnt_off0000f9a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A5 12516 bytes
SHA-256: 6002722762769583f92c05fdde009ca05018fc2f3dd559fd49ddddd6b2f18624

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