Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3bca984735f8367…

MALICIOUS

PDF

105.3 KB Created: 2021-03-29 22:43:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 58c9cc710a585f14db80b64b277136ef SHA-1: 5b1cd3e804b29593923ea078d4862c05abb2c772 SHA-256: c3bca984735f8367c5c5b834259b779dd6fb0b7769b753a9c7c2484762eb8d43
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded links, many pointing to disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://botokaw.ru/123?utm_term=2011+all+bollywood+movies+list PDF link annotation
    • http://fedemofutig.22web.org/volleyball_rotation_sheet_blank.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408471/normal_6006f66879882.pdfIn PDF document text
    • http://najetaxu.mygamesonline.org/all_in_one_science_cbse_class_10th_term_ii.pdfIn PDF document text
    • http://figedizizexi.22web.org/achilles_tendon_rupture_exercises.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387562/normal_5ff18eca6eda5.pdfIn PDF document text
    • http://bazunujovi.scienceontheweb.net/burt_harding.pdfIn PDF document text
    • http://pusaburuku.22web.org/38591535048.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369656/normal_5fdb3db0df042.pdfIn PDF document text
    • http://nutusugeralinet.mypressonline.com/palejoluxuxakivoturapif.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/c6697bab-47cb-4034-be47-aa42c0889af9/how_to_connect_dish_to_mobile_hotspot.pdfIn PDF document text
    • http://vemesivudaro.epizy.com/98447965742.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e282e6d-311a-421a-bf46-082df9321aa7/recette_de_sandwich_mou_sucre.pdfIn PDF document text
    • http://xigibisas.rf.gd/bopaluporomukezenogixo.pdfIn PDF document text
    • https://4fe85328-8dbf-40e9-afa8-2c8d6ff8a9c8.filesusr.com/ugd/9c0842_29ea03d1cb794dc9a8bc4fabb62ee464.pdf?index=trueIn PDF document text
    • http://dusefepov.epizy.com/manual_lava_roupas_brastemp_ative_11kg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8a409cf-0588-4ca0-9141-4531bcfdd27e/69253302068.pdfIn PDF document text
    • https://50bf384a-eeac-4f26-a262-e2ba1a5e00ba.filesusr.com/ugd/17159d_d027e10b57614473995497f3ad96cf9d.pdf?index=trueIn PDF document text
    • http://gedonoseg.epizy.com/bekirijez.pdfIn PDF document text
    • https://2e5cbe44-7de3-4e3f-b94c-8a8567814465.filesusr.com/ugd/f96b02_c876751c52274eeb97ff4148433c85ee.pdf?index=trueIn PDF document text
    • https://0fc0baf9-b884-4fcd-968e-f93c0f938930.filesusr.com/ugd/68ec51_3c2e9f79ed7c460bb0cd29e2463fe653.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6fcf85d-dc37-42dc-82f1-ede4a4be3f46/keys_backyard_spa_models.pdfIn PDF document text
    • http://xirozaza.onlinewebshop.net/online_bus_ticket_format.pdfIn PDF document text
    • https://b5c90759-dbf8-4ccd-b12d-e23c958527f9.filesusr.com/ugd/915a55_a9e0bd2122e944cc8c2045d8eeb3ac90.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ca621d7-61fe-4100-a8a1-06426ac0d32c/9897122434.pdfIn PDF document text
    • http://pulejebolev.rf.gd/icivics_review_worksheet_interest_groups.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_off00015f76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F76 5500 bytes
SHA-256: 69920d1f57cfde31c9ce8c68ec21bb01b5222658309b796daeee1c6f981ec4d7
font_01_sfnt_off00017230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17230 11132 bytes
SHA-256: 7063e3c9cbde0b40df2a446155cda9a0110bb1d9cb6309bb1bcaa34e23ee31d2