Malicious PDF — malware analysis report

Static analysis result for SHA-256 809a6ec8a3f16642…

MALICIOUS

PDF

78.1 KB Created: 2021-03-24 18:44:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f0838a0f3e5dcd8d3d11c11a825bd91e SHA-1: 8b0797070e3d479a250ebb5b0bddc0ac5aa22e8d SHA-256: 809a6ec8a3f1664257d08515374814e419a4f4c88abe7460a501c2bd02d6b5ae
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-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://maypoin.ru/wix?keyword=david+brown+990+owner%2527s+manual+pdf PDF link annotation
    • https://cdn.sqhk.co/kezixowog/ijsMnzX/free_robux_hack_no_verify.pdfIn PDF document text
    • https://katalajoguv.weebly.com/uploads/1/3/2/7/132740778/vuzurajakiti-wuronabomefidul-fosepinaj.pdfIn PDF document text
    • http://filfex.ru/how_to_reset_luminous_inverter_overload4wjke.pdfIn PDF document text
    • http://effektzhizni.ru/yard_machines_snow_blowerwalgg.pdfIn PDF document text
    • https://cdn.sqhk.co/doxutijewu/hgcZbIB/xoranemasukewuzibusixax.pdfIn PDF document text
    • http://chambre.xyz/mn_dmv_drivers_test_appointmentdhqid.pdfIn PDF document text
    • http://dedaruk.scienceontheweb.net/business_management_ebook_free_download.pdfIn PDF document text
    • http://copyrightshelpscenters.com/spencerian_script_practice_sheets99lio.pdfIn PDF document text
    • https://cdn.sqhk.co/zexetiminav/dHyiaJ7/jejufatavekixakokekujik.pdfIn PDF document text
    • https://siragakepog.weebly.com/uploads/1/3/4/8/134890789/8626527.pdfIn PDF document text
    • https://cdn.sqhk.co/livukigelo/d7t4Tug/ritoxuxojoril.pdfIn PDF document text
    • http://sun-italy.space/where_to_buy_toyota_techstream_softwareuwm87.pdfIn PDF document text
    • https://jikodidujur.weebly.com/uploads/1/3/5/3/135319234/kijagugadutet_wekutilibojin_xebulapu_dapibazef.pdfIn PDF document text
    • https://gipavenox.weebly.com/uploads/1/3/5/9/135966662/c45d6618.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/7246411d-3d99-4b1a-ac10-0f6fbee9b51d/free_online_forklift_training_and_test.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae467b04-6a67-412c-b509-012771d8a399/how_to_write_a_great_analysis_essay.pdfIn PDF document text
    • http://salajire.onlinewebshop.net/6717631599.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0054a898-8d27-4ef3-b47a-2c30997b35ab/dejimuked.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB52 5812 bytes
SHA-256: 7031f939ad2d67902de07563ca0db494e17417730e5814112b4f252e42034892
font_01_sfnt_off0000ef1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1A 10796 bytes
SHA-256: e78766ad70ebc5e3740aa65ae86365cb7ea6cd59fe98c76bc8053e1bfeb85c0b
font_02_sfnt_off00011382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11382 16204 bytes
SHA-256: 31aa257675234f953cb39254c73a0c002637764ec2691c470e0912636c3685cf

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