Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3d56cfd89992ff2…

MALICIOUS

PDF

76.4 KB Created: 2021-03-26 07:52:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 8ae8042818a3b2c2f1a3399038939cae SHA-1: 9ef40689d5dcd66912a3cb83c80958ee94b8a658 SHA-256: f3d56cfd89992ff216d6de122dcea2e0779551a651d2ca7d81bd1265a4f68c03
126 Risk Score

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 0.9991

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://seumenha.ru/award?keyword=ncert+maths+book+class+5+solutions+pdf+free+download PDF link annotation
    • http://twirlini.com/wv_dmv_permit_test_cheat_sheetqvr1f.pdfIn PDF document text
    • http://7lessons.website/jatuvewapze5vi.pdfIn PDF document text
    • https://cdn.sqhk.co/ninujamezol/jgfa8ax/57611503869.pdfIn PDF document text
    • http://lumacy.site/1_tbsp_unsalted_butter_nutritional_information376ej.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • https://cdn.sqhk.co/kutogudofi/fRyijhf/tevabejanojomomejo.pdfIn PDF document text
    • https://mirivibi.weebly.com/uploads/1/3/4/2/134234555/ziniwuzunudusokiviz.pdfIn PDF document text
    • https://poduxerot.weebly.com/uploads/1/3/0/7/130776630/lokunax_xamufawuvisi.pdfIn PDF document text
    • http://criticcxck.space/40k_8th_edition_rulebookds0oc.pdfIn PDF document text
    • https://cdn.sqhk.co/kufagilan/Lzrhahg/carly_rae_jepsen_emotion_album_zip.pdfIn PDF document text
    • https://cdn.sqhk.co/mosepoxik/Q5hjeSj/badland_brawl_funcheats.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/bipepezuwed/tft_cheat_sheet_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45adb2b8-20ab-47f3-af09-0f575dd1573e/70273532494.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a456c7f2-feb3-4975-bf18-8c817e6a0c7f/madame_guyon_prayer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d556ce4-602d-4540-90ed-193a7b4480df/sabijabumibijofaliso.pdfIn PDF document text
    • https://s3.amazonaws.com/loneminovu/bootstrap_free_templates_for_image_gallery.pdfIn PDF document text
    • https://d03ec42c-8b93-48d3-a61e-9aee396c0db4.filesusr.com/ugd/1e557c_e28cad3f84ee441c96d020b99496e53b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zetituri/tarupenupigozepewenes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa3aeaaa-3b3a-4599-a2e5-ac422096ea1f/59463432795.pdfIn PDF document text
    • https://4121a797-204a-431c-92a8-8e24072fb342.filesusr.com/ugd/b972d5_ba5ac95c8e184eeda7a7d72bf653e139.pdf?index=trueIn PDF document text
    • https://1eb42bdc-3da6-4b32-b75f-4382f1721f8e.filesusr.com/ugd/35474d_83b47f4cdbd848f58925f42484f09f04.pdf?index=trueIn PDF document text
    • https://a2ae8793-a99f-480d-a3bc-849ef63d34f7.filesusr.com/ugd/cc207a_b9e7e87f9fb340ee93e8c661c718dc5f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vexosafugunu/rewew.pdfIn PDF document text
    • https://0491f86b-060d-4f4a-be23-b0d01488777f.filesusr.com/ugd/faa7ef_7d6fe1058623488fa7f62d512a209d21.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/libowebujakux/nuribifizapomatokaboto.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7C 5784 bytes
SHA-256: 013df9b336b31b7390945a9f288778e6f043219f8a12c4f65792f2e9ee81656d
font_01_sfnt_off0000ff15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF15 10724 bytes
SHA-256: e6ac4186e21cb8c33a482aca4165209c32083f65748c70d59bbc054d6155e42d