Malicious PDF — malware analysis report

Static analysis result for SHA-256 8babf196d90a682c…

MALICIOUS

PDF

78.2 KB Created: 2021-03-24 02:34:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 513f5cb532100941b389a81a8b55f53a SHA-1: c903c4e41774634316b6184ed40d8e6dc681f014 SHA-256: 8babf196d90a682cbfbe2b58c93d1b56c5f97dca636f94af2dd85647aa03dedc
126 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The document contains numerous embedded URLs, with a primary focus on redirecting users to potentially malicious sites like 'seumenha.ru' under the guise of providing academic answers. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a deliberate attempt to create a network of disposable links for SEO manipulation or to host malicious content, further supporting the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/strik?utm_term=what%2527s+the+word+answers+science+9th+grade PDF link annotation
    • http://rezokivi.medianewsonline.com/67900399267.pdfIn PDF document text
    • https://cdn.sqhk.co/rerunaropiz/heIjitt/hand_held_drill_press_stand.pdfIn PDF document text
    • https://cdn.sqhk.co/mugegiduveb/hiFjgMg/ups_golden_valley_minnesota.pdfIn PDF document text
    • https://cdn.sqhk.co/kopilixa/d2ghnji/70882559337.pdfIn PDF document text
    • http://zuregazezoral.mygamesonline.org/how_to_setup_canon_printer_wifi.pdfIn PDF document text
    • http://luwogexejel.getenjoyment.net/sap_hana_basis_tutorial.pdfIn PDF document text
    • http://larokamexi.sportsontheweb.net/mekaw.pdfIn PDF document text
    • http://gekifek.scienceontheweb.net/xebofagunax.pdfIn PDF document text
    • https://cdn.sqhk.co/putizimetiwe/OYjiTV2/a_b_g_ka_full_form.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f84ffea9-2755-49c2-9cb5-47ca8b55fe65.filesusr.com/ugd/0adedf_1678bd9d3edf477cb328c2643aa481a0.pdf?index=trueIn PDF document text
    • http://bikutuvuxaxixo.epizy.com/89193351564.pdfIn PDF document text
    • http://fudipakuvile.epizy.com/31685751842.pdfIn PDF document text
    • https://2a26c5f8-c4f8-4af8-830b-7e2c9961bd8e.filesusr.com/ugd/2e4362_e83d4788470f479aa9c071961bc07c24.pdf?index=trueIn PDF document text
    • http://netomadutimafe.onlinewebshop.net/pineal_gland_third_eye.pdfIn PDF document text
    • https://b54663a3-ff9d-4122-b75c-69b71428c9b0.filesusr.com/ugd/cfa91a_e82a2fdc4a6f4a1194f68cd486b1f19b.pdf?index=trueIn PDF document text
    • https://f72e0e13-a873-49c5-9cb5-3c2848b8c5b2.filesusr.com/ugd/f8ba4b_78cfba2f2bf54b1ab854ab1d59b0757f.pdf?index=trueIn PDF document text
    • http://saxarivoje.onlinewebshop.net/sokaduxuneka.pdfIn PDF document text
    • https://656adf98-7a81-40bd-8d0f-2b9c27d09201.filesusr.com/ugd/268ab1_ad597e24f73a4112b47f7e64be3ad3ae.pdf?index=trueIn PDF document text
    • http://xamusewegelaru.rf.gd/sta-rite_max-e-pro_pool_pump_owners_manual.pdfIn PDF document text
    • https://3f7ff619-1e23-491c-a925-ddda4d79b49c.filesusr.com/ugd/79c22a_6544c50324684009ba6bbd947065ca0e.pdf?index=trueIn PDF document text
    • https://d8ec88ce-93b1-4b83-b294-7016fd5b5063.filesusr.com/ugd/366252_3de953e9402a41dca30e8b6b22f2bdb9.pdf?index=trueIn PDF document text
    • http://gegurobaz.myartsonline.com/unscramble_sentences_worksheets_for_grade_1.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_off0000ef33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF33 5464 bytes
SHA-256: 971f97303af889eebb59d2e745ed70fa8b9dddb82cdab761a39a63d5ffa24d9c
font_01_sfnt_off000101e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E0 12504 bytes
SHA-256: 74c18e5df2f9a58e36532e5a96f6d8dcc3472f18a97b5f806203d0c0ed6a7a6a

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