Malicious PDF — malware analysis report

Static analysis result for SHA-256 7549cf49bcd76d8c…

MALICIOUS

PDF

73.9 KB Created: 2021-04-23 16:56:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 07da54b2e9ce0e4bb44e525a2a0fd89c SHA-1: 5a364025746ff06ee699f0f32e77c10454379125 SHA-256: 7549cf49bcd76d8c024584afd56f55660bcaa610933e962b4330cc7dfc00b4d1
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 0.9996

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://crophysi.ru/strik?utm_term=stylish+academic+writing+summary PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4446642/normal_604420b2deedb.pdfIn PDF document text
    • http://bodipok.getenjoyment.net/gosamiragadexe.pdfIn PDF document text
    • http://vamefegali.mywebcommunity.org/gezazonegutinokopavanubiz.pdfIn PDF document text
    • https://pesudimudoselu.weebly.com/uploads/1/3/2/6/132681392/1136212.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446782/normal_5fda16eab5aeb.pdfIn PDF document text
    • https://bomefojidog.weebly.com/uploads/1/3/2/6/132695402/6531408.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426087/normal_6004ef865f4f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380080/normal_6031070f5ab9f.pdfIn PDF document text
    • http://jepewadagamer.scienceontheweb.net/new_construction_company_profile_sample.pdfIn PDF document text
    • https://cdn.sqhk.co/tusenepobam/ggAjh1v/do_not_press_the_red_button_prank.pdfIn PDF document text
    • http://lezeninimi.medianewsonline.com/zinifovuwidafuxa.pdfIn PDF document text
    • https://nepefesin.weebly.com/uploads/1/3/1/4/131410606/bf0a4a1b0c7015.pdfIn PDF document text
    • http://ripugusulufiluj.getenjoyment.net/51060629778.pdfIn PDF document text
    • http://mazejofeg.mygamesonline.org/jubojojejaj.pdfIn PDF document text
    • https://cdn.sqhk.co/vitimosugu/HigXhjF/legafow.pdfIn PDF document text
    • https://ginuwawabesinu.weebly.com/uploads/1/3/1/1/131164414/134045.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nupuzawov.onlinewebshop.net/carol_of_the_bells_piano_sheet_music.pdfIn PDF document text
    • http://romofimor.onlinewebshop.net/53751041606.pdfIn PDF document text
    • https://ef733714-782c-48ea-8991-1bc0bf0c95f2.filesusr.com/ugd/ad2ade_f7ea2c2f97aa453f9cde59011fd60203.pdf?index=trueIn PDF document text
    • https://6cbe2f5c-748b-4bc6-b691-25a968a47885.filesusr.com/ugd/d6b5da_6414d3b816eb426fb858856de86693ea.pdf?index=trueIn PDF document text
    • http://wutesejib.onlinewebshop.net/kaworadonovedevexunugale.pdfIn PDF document text
    • https://c580675e-8888-491d-8c80-3106eaac86fb.filesusr.com/ugd/c8a981_74296d3a9f834e278c48955146e8b68d.pdf?index=trueIn 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_off0000e49f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE49F 5648 bytes
SHA-256: 71ba499156ad38a0b0eed64020395b8f6269d7b3c37706c260fa533c69e09a3d
font_01_sfnt_off0000f7be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BE 10228 bytes
SHA-256: 1353e673751e2233bed65eec9849af823437503b8b2e01ccd6a7366057d1f0c0

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