Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe8f38d0c3c5403c…

MALICIOUS

PDF

86.2 KB Created: 2021-04-08 04:29:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 277b4e9069bd524caf2ecdd1240bb520 SHA-1: b084c7b562e7671a88f37b64ac49b52e5b263e90 SHA-256: fe8f38d0c3c5403cfa9b5490af95e4f14610bb7ad2855187ce75de3f5e07adf3
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 0.9992

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://mezovuduw.ru/123?utm_term=the+appendicular+skeleton+lab+report+13+quizlet PDF link annotation
    • http://bijowuxupolapi.sportsontheweb.net/materi_amandemen.pdfIn PDF document text
    • https://cdn.sqhk.co/nipigagavadu/hijhyha/13312660920.pdfIn PDF document text
    • https://cdn.sqhk.co/navimoxa/gjooSAt/duo_mobile_app_icon.pdfIn PDF document text
    • https://cdn.sqhk.co/pasivuzuke/ihhgia8/camtoplan_ar_measurement_tape_measure_apk_download.pdfIn PDF document text
    • http://rowowesofazov.medianewsonline.com/bible_atlas_free_download.pdfIn PDF document text
    • http://jamonomikusuka.22web.org/xalokudasigufilopoxoguza.pdfIn PDF document text
    • http://gomigapujasep.sportsontheweb.net/number_theory_solution.pdfIn PDF document text
    • https://cdn.sqhk.co/wizokawoxo/ihTgiLn/alone_marshmello_lyrics_video.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
    • http://godusisoti.onlinewebshop.net/76172298988.pdfIn PDF document text
    • http://pimoxonevuwewax.atwebpages.com/ntn_bearing_catalogue.pdfIn PDF document text
    • http://mozaninukokefef.onlinewebshop.net/74061195767.pdfIn PDF document text
    • https://d4cba69e-f3c5-4a64-9e40-69ba24924691.filesusr.com/ugd/b73feb_3aff0e1bc1cc4a6797560d2ab624f4d8.pdf?index=trueIn PDF document text
    • https://1fa67a36-2e8b-44cc-a955-751d80433762.filesusr.com/ugd/d85e51_e629660ff1a64dfaa8b663b34d58606a.pdf?index=trueIn PDF document text
    • https://a2fe464c-28d1-4db8-bb2d-552ad9bc2f4d.filesusr.com/ugd/941bb1_0d63f082e6f54864b8c1a3fe344f55a8.pdf?index=trueIn PDF document text
    • http://rukosivujuxu.atwebpages.com/contoh_askep_pneumonia_pada_anak.pdfIn PDF document text
    • https://1c54689f-8f60-44d8-8d81-b144d6ea8ada.filesusr.com/ugd/787b0a_8903b778a47440f6a5bd6dbd03959f07.pdf?index=trueIn PDF document text
    • https://aa6eca1a-c690-4a36-985e-a873157a80b3.filesusr.com/ugd/081493_931bb0a8231c4f90a11ceb4a41e622e4.pdf?index=trueIn PDF document text
    • http://valaxamagiladir.epizy.com/60677797056.pdfIn PDF document text
    • https://6e345194-e688-4037-aa24-2ff230a16836.filesusr.com/ugd/ce9fe1_84a897d4c43a4dec8c5d0981ee96f2e5.pdf?index=trueIn PDF document text
    • https://2987c0f4-171e-4473-b3f1-a5468658115b.filesusr.com/ugd/75ff8a_020f7c4189b34147b86c34772fadb438.pdf?index=trueIn PDF document text
    • http://madotiz.rf.gd/99997401477.pdfIn PDF document text
    • http://jokubamobivavum.onlinewebshop.net/69070667082.pdfIn PDF document text
    • https://79e8b926-cc52-4cef-90ae-68e3990d752e.filesusr.com/ugd/694d5d_63efccaa05ae4e2ca9cd1b672ebef3fa.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10427 5588 bytes
SHA-256: e5dd9d655c887478606171dcf64e097b511d30829cbb3f5073102dcfebda753e
font_01_sfnt_off00011715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11715 11608 bytes
SHA-256: c7e7c2c259a802af43761a5bb2dacc714fc93a4326d8d72ba3de633b2ddd2ae4
font_02_sfnt_off00013cf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CF6 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333