Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3a23a743b746d38…

MALICIOUS

PDF

70.8 KB Created: 2021-03-19 11:16:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: c6bf7a3e10e2ba86170282ed074383b5 SHA-1: 37d70d0c65a377731406006f30b274afbc126688 SHA-256: f3a23a743b746d384151370fdc044760b3c69665ba62d56cacdfa84fd60dec35
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/123?utm_term=web+server+raspberry+pi+performance In PDF document text
    • https://static.s123-cdn-static.com/uploads/4449012/normal_5ffec4c88d09c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446921/normal_60214e5c3b20a.pdfIn PDF document text
    • http://fipagolanikobax.mygamesonline.org/sotosixofifer.pdfIn PDF document text
    • http://ludesajezopaju.medianewsonline.com/kewudefisuwotad.pdfIn PDF document text
    • http://jekeluxuto.mywebcommunity.org/english_dictionary_app_for_android_without_internet.pdfIn PDF document text
    • http://pivojowemetobiv.mywebcommunity.org/what_are_the_best_golf_apps_for_iphone.pdfIn PDF document text
    • http://tuwuneluzuso.22web.org/yowhatsapp_7._99_update.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479433/normal_601603bb97895.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405930/normal_5ff2220f8c228.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454670/normal_60437e983b709.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380527/normal_603f6bded883a.pdfIn PDF document text
    • http://remigajapalogu.22web.org/mecanismos_de_afrontamiento.pdfIn PDF document text
    • http://bewujasixi.mywebcommunity.org/16102340656.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392649/normal_600a1568466a7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wozoxub/gowud.pdfIn PDF document text
    • http://lozekav.epizy.com/badminton_game_full_information.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffae08bf-9e2a-40c7-9433-f6b193ed8a91/toranupogumobopapesexuji.pdfIn PDF document text
    • https://s3.amazonaws.com/vososasoxumete/how_to_compress_a_music_file_on_mac.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15637800-3f3f-44d4-a425-ed23cb2dd2ea/machine_learning_algorithms_python_libraries.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

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C6 5444 bytes
SHA-256: 34d65cbd6678fd93f607614a6b2c5bf63dc9dc91e07be23a9a9fc6c6b1ba4a76
font_01_sfnt_off0000e84d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84D 11124 bytes
SHA-256: e09f3fc396aba95d592682e3c41fbb42a64a8bf43415cb3f576d36cd2f84a415

Open this report in the interactive analyzer, or submit your own file for analysis.