Malicious PDF — malware analysis report

Static analysis result for SHA-256 743d270cb70854a9…

MALICIOUS

PDF

79.1 KB Created: 2021-03-17 19:52:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 6a0f7c8d478839b52fc21467b93d9b30 SHA-1: 36861063e7c4eff71e73c0c3581ca8b2b2c4a828 SHA-256: 743d270cb70854a94bd343916e0830299a08f5693adc56cf935b226eab2a2cb4
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 0.9998

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://bologen.ru/wix?keyword=atomic+structure+and+chemical+bonds+worksheet+answers+chapter+16 PDF link annotation
    • http://olivamebel.com/who_played_bruno_in_the_boy_in_the_striped_pyjamas4dgw0.pdfIn PDF document text
    • http://nakekizedexu.getenjoyment.net/what_to_do_if_you_fail_pre_employment_drug_test.pdfIn PDF document text
    • https://xigakoter.weebly.com/uploads/1/3/1/3/131379919/6458766.pdfIn PDF document text
    • http://habercigo.com/google_earth_flight_simulator_apkotci4.pdfIn PDF document text
    • https://diritirafimiwav.weebly.com/uploads/1/3/4/3/134376035/1197320.pdfIn PDF document text
    • http://avit0.pro/39044011899my3zd.pdfIn PDF document text
    • http://tebeririz.scienceontheweb.net/who_picked_the_books_of_the_bible.pdfIn PDF document text
    • http://slampochka.ru/jikuriwikibivajebaw5yiy9.pdfIn PDF document text
    • http://instapriz.online/minecraft_construction_handbook9ymn0.pdfIn PDF document text
    • https://deremufirig.weebly.com/uploads/1/3/4/8/134854029/7a7a3f9979b.pdfIn PDF document text
    • http://bella24.xyz/40093017792if288.pdfIn PDF document text
    • http://libralab.digital/bovedojak400j1.pdfIn PDF document text
    • https://danifiwap.weebly.com/uploads/1/3/4/5/134585556/vixedeselaxonu.pdfIn PDF document text
    • http://ens-pictures.ru/coreldraw_old_version29oo6.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/51ec1aaf-20c1-409b-b71a-b59eaa6b491c/harrison_internal_medicine_amazon_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd225475-7037-4b6d-94ca-a9805da9403e/93304440903.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn 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_off0000de4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4B 5804 bytes
SHA-256: ebbb373f765778e727ef5fafeacad93cd5ed95eddc78ceb114f096ced11594b4
font_01_sfnt_off0000f1f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F8 11120 bytes
SHA-256: 8fc46906ca4c3837d9a5d213c769f4483c46edcbc73691c747d6db4a55ff534a
font_02_sfnt_off00011806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11806 16080 bytes
SHA-256: 014fdb7076ebfc326e48e50914f0077be73d9a972b327c9fef30e9d59f054234

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