Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb821bc01cbc5aac…

MALICIOUS

PDF

102.1 KB Created: 2021-06-10 03:02:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: c2dad81e038eabe29274ab093e0a43dd SHA-1: b78471ebcb574619e2e45228f006cc89b64237a5 SHA-256: bb821bc01cbc5aacdbaf4177bcd1f05d8ed0426e26aca5ceba189254f5653e17
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 0.9988

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://queure.ru/pbw?utm_term=c+programming+bangla+book PDF link annotation
    • https://mikugixu.weebly.com/uploads/1/3/1/4/131438693/30321c0be12.pdfIn PDF document text
    • https://jabuvevakeg.weebly.com/uploads/1/3/4/6/134685488/pobizasine.pdfIn PDF document text
    • https://velumosatowe.weebly.com/uploads/1/3/4/8/134883763/zagara.pdfIn PDF document text
    • https://fedubipogumuwu.weebly.com/uploads/1/3/1/3/131379546/kugusijokisifuvowo.pdfIn PDF document text
    • https://vejotawugupexo.weebly.com/uploads/1/3/4/7/134756202/113d8ee468e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478387/normal_5fe79ac984a95.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480753/normal_60c1483b7a64b.pdfIn PDF document text
    • https://bawosizegidaw.weebly.com/uploads/1/3/1/4/131411147/5707610.pdfIn PDF document text
    • https://gakikodokuni.weebly.com/uploads/1/3/1/8/131857060/nugivozidif.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zegugas.pbworks.com/f/lego_star_wars_3_red_brick.pdfIn PDF document text
    • http://wodupabizel.pbworks.com/f/street_fighter_4_android_apk_full.pdfIn PDF document text
    • http://dojejezo.pbworks.com/w/file/fetch/145001532/nifalelajotuk.pdfIn PDF document text
    • http://vakerul.pbworks.com/f/free_excel_assessment_test_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c296e5bd-82da-42e2-bf32-c936d8702b57/36237217457.pdfIn PDF document text
    • http://zikupuzajix.pbworks.com/w/file/fetch/144574053/jijiwimamipeji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f170a48-28fc-4c4a-a61c-8a58e01d4964/levowojonoserom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5866d33b-1420-4b4f-80c5-78102e12ca97/the_secret_life_of_bees_ebook_download_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e414853e-5c19-40cc-bd3d-b9b2400eb1b6/romekutapipediruwepojigur.pdfIn PDF document text
    • http://kemususi.pbworks.com/f/panulojakiwo.pdfIn PDF document text
    • http://pajinap.pbworks.com/f/is_the_samsung_note_10_5g_dual_sim.pdfIn PDF document text
    • http://tozuxexap.pbworks.com/f/20470156835.pdfIn PDF document text
    • http://kepigiwup.pbworks.com/f/rizowodedorive.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://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012e40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E40 5068 bytes
SHA-256: bbb2fadadaaed5c58aa4470c43be84e2e6a03bb92747b60a1a46fe7ee6a75d43
font_01_sfnt_off00013f63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F63 4140 bytes
SHA-256: fbdd9df555c8710fa493947bde41d1b30e4b750f457ece442df516a7dd53c510
font_02_sfnt_off00014c89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C89 12392 bytes
SHA-256: 6f68234eebcd2c2c9f4bb0281133e66aadbbdd6ff8bf4fe1c2dbc29eb032f025
font_03_sfnt_off0001755d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1755D 16060 bytes
SHA-256: 2173a1880e9f774f759393e7d0d28dda91d04d8a3eae6bea41b822770b343b90