Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac551a3e6404f32f…

MALICIOUS

PDF

88.7 KB Created: 2021-03-17 21:25:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b7dd1a526c65822a9f4bd02708445d4a SHA-1: 5c4623368b1168b092589eb56164fe832aaa5f00 SHA-256: ac551a3e6404f32f7203ce3957df5f4c211faf3e5a4d3ba947ba48f4ea4ef0c3
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 0.9970

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://vilenefex.ru/award?keyword=oxford+phonics+world+pdf+vk PDF link annotation
    • http://zinobinipote.22web.org/critical_thinking_skills_activity_7_answers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503787/normal_6048081f42fd0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460460/normal_5ff756ae38078.pdfIn PDF document text
    • http://ubzvp.com/2300248746algcl.pdfIn PDF document text
    • http://lavkavkusa.store/11355076339de20c.pdfIn PDF document text
    • http://1offpark.xyz/calligraphy_letters_guidert95s.pdfIn PDF document text
    • http://kdghy.online/how_to_get_viper_7856v_out_of_valet_mode6jt5u.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457279/normal_603262cc7ae6a.pdfIn PDF document text
    • http://gamedv.design/estructura_cubica_simplewdj7w.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://uploads.strikinglycdn.com/files/27eaf025-c6e5-4e59-a0ea-4372b6a08a6a/how_to_build_a_chicken_coop_free_plans.pdfIn PDF document text
    • http://legofovivaxom.epizy.com/concepts_of_java.pdfIn PDF document text
    • http://demunoj.epizy.com/bittere_aprikosenkerne_kaufen_reformhaus.pdfIn PDF document text
    • https://3c4962d9-41f7-4f14-8396-dad57cc8de20.filesusr.com/ugd/a2de88_a20b21c6a5c040b2836ddf9ce9c42378.pdf?index=trueIn PDF document text
    • http://rilulavonepuv.epizy.com/koguforenurozexasabu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e693d0b3-4b7d-46a6-b72d-d69d6f748603/how_to_change_a_medline_thermometer_to_fahrenheit.pdfIn PDF document text
    • http://netifikapiwi.epizy.com/binifadajanodili.pdfIn PDF document text
    • https://a7563df4-ba19-4d82-a8a0-b2470d957038.filesusr.com/ugd/61f964_fa30acb0031b4b73af66d989cdca16d3.pdf?index=trueIn PDF document text
    • http://sabepusejoponi.epizy.com/blood_groups_and_their_importance.pdfIn PDF document text
    • https://0ac950e2-707a-4e47-8bf4-daface0ea9db.filesusr.com/ugd/356f11_33af8564ab994935a9e4da5f79bca18f.pdf?index=trueIn PDF document text
    • http://tikarere.epizy.com/resistance_tube_exercises_youtube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10dd1dbb-ca44-45cd-b80a-262f74b661f8/java_soap_web_service_example_mkyong.pdfIn PDF document text
    • https://436240a4-ef10-404e-ad90-c5cab949c7af.filesusr.com/ugd/3fb742_84aca07e019d4948a919749165ab46cd.pdf?index=trueIn PDF document text
    • https://98771922-91e4-4673-aa0d-7794f4435593.filesusr.com/ugd/b6aaa0_0f1442ab4dee4d659b6729a0c5bc9346.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00011a33.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11A33 23832 bytes
SHA-256: 45c707b7401cc64bb29935578a62da139399117bce93a7022261a587dae39313
font_00_sfnt_off0000d62a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD62A 6588 bytes
SHA-256: 4e1a9c4cb32f1bc4ff176ae4dc1460c31b2d267bf2def0252f23ad2731e7be72
font_01_sfnt_off0000e6a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A3 4936 bytes
SHA-256: f9c5c87eeec42093792eabc2518959e35ad868e9f81b54a55da7412bbc50fb91
font_02_sfnt_off0000f770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF770 10140 bytes
SHA-256: 37a417afe8b68fc839cb0292efa1b269efd9b0c024c494b6de45624c3fb215bf
font_04_sfnt_off00014452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14452 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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