Malicious PDF — malware analysis report

Static analysis result for SHA-256 61b6d4c9aa7d4fa8…

MALICIOUS

PDF

78.7 KB Created: 2021-03-29 08:27:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 626bf6ff7db839c7824140ab636b3351 SHA-1: e08caca4c2edbc02db7ee379c4e9fcd07017f5ea SHA-256: 61b6d4c9aa7d4fa8641eaef6c4478e39d81825acd4206c56de674323ba42b7f2
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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 and routes users through malicious redirector infrastructure. 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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wix?keyword=biografia+de+thalia+resumen In PDF document text
    • http://tlgfree.xyz/ars_notoria_espaol_descargar81wb9.pdfIn PDF document text
    • http://lolupinese.22web.org/fifty_shades_of_grey_full_book_wattpad.pdfIn PDF document text
    • http://eushopvmn.site/femeroziwi1cbu0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495849/normal_6012126102ec0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444102/normal_6037d0c68e442.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375699/normal_604c9c7116dce.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380210/normal_5fdf5a09ecc36.pdfIn PDF document text
    • http://tonagruz.ru/what_is_news_nation_nowerrx5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://48e4e0df-78ce-4736-8797-27735e68dc67.filesusr.com/ugd/f3b179_8066e83920a545969d61aa7a33fb4ad0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sosupejuxofedo/discworld_unseen_academicals.pdfIn PDF document text
    • https://s3.amazonaws.com/bizamesuwepe/sawevapigugosemegaga.pdfIn PDF document text
    • https://s3.amazonaws.com/padosumifubobo/zediwovezibusegunije.pdfIn PDF document text
    • https://s3.amazonaws.com/sixenogafopoj/xbox_360_s_with_kinect_manual.pdfIn PDF document text
    • http://pimokizogo.epizy.com/system_analyst_skills.pdfIn PDF document text
    • https://s3.amazonaws.com/wovigebi/portswigger_burp_suite_professional.pdfIn PDF document text
    • https://e46eb8ae-11b5-47af-91b5-79e2db369635.filesusr.com/ugd/f84671_1cb95c8d9458490787f04e607c74b7b3.pdf?index=trueIn PDF document text
    • http://kepojuwewi.rf.gd/25115282509.pdfIn PDF document text
    • https://b3a1a1c9-4f8f-4fb8-b7cc-7339030cc889.filesusr.com/ugd/162fe6_d6d2edf3c1de4c62aa110818cf5315cb.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e77e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE77E 5252 bytes
SHA-256: 0b1750f8e26df1b799c85f0ed951046c9529ecab938882c5c269814b3f77cbd4
font_01_sfnt_off0000f92f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92F 11408 bytes
SHA-256: 150d987594aa84ee8a26311f201a38c2c93664ef7e7ff38b6ec88a148ab3602a
font_02_sfnt_off00011e11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E11 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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