Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac92bc8bd3afa074…

MALICIOUS

PDF

76.3 KB Created: 2021-06-07 04:21:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 7b01c3d6b82659d0de3146282f49ccd6 SHA-1: 57f9ba38b37c6c71a9432a1acf426aefd8d20dbe SHA-256: ac92bc8bd3afa07474ac5adbe8130cea2a2468fe0eb0606316f575d222757824
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by an ML classifier as malicious. It contains a large number of external links, many of which point to disposable hosting, suggesting a link farm or SEO manipulation tactic. While some links are marked as benign, the overall structure and the presence of numerous external URIs indicate a high likelihood of malicious intent, possibly to redirect users to phishing or malware sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://medvor.ru/wb?keyword=philippine%20red%20cross%20first%20aid%20training%20schedule%202019%20muntinlupa PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4484835/normal_5fefc616a4b5f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379611/normal_5feef72d01bec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469847/normal_6054f46a81693.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446494/normal_605099580fe10.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413347/normal_6001e3b90bfd0.pdfIn PDF document text
    • https://pirusamu.weebly.com/uploads/1/3/1/3/131383726/3120278.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493610/normal_605a5d70c606d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450641/normal_6040fb3446fd1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379474/normal_6014bd41801f7.pdfIn PDF document text
    • https://xuviwutub.weebly.com/uploads/1/3/4/6/134697068/xulurumogovexa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383689/normal_602f0c2ab36f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385004/normal_5fd3b5f2b56c8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kuperuxowix.pbworks.com/f/alone_together_tagalog_full_movie_online_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b356111-0fea-499d-b479-79de59caa0e4/terifuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8571f7a1-d884-4ddb-9725-78628fe31dfa/25735994035.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3563ab71-5f6e-4690-99dd-fc99b750388e/usmle_step_1_anatomy_sample_questions.pdfIn PDF document text
    • http://lekipirunezi.pbworks.com/f/bulurilikajepikopesazuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/766152e7-8a6a-405d-91ee-b9ad19070003/visajo.pdfIn PDF document text
    • http://gosirata.pbworks.com/f/how_to_find_alien_containment_in_subnautica.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc767cbe-5741-4c08-b4a7-686db54bf54f/thermos_grill_2_go_fire_and_ice.pdfIn PDF document text
    • http://fadoposapat.pbworks.com/f/72993962762.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0b9ff1c-ae6e-4fc5-91f2-aee1fc2b2514/what_is_the_synonyms_of_aid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e14f8dc1-8a94-4a64-898f-93a0c691c121/risop.pdfIn PDF document text
    • http://katafuzum.pbworks.com/w/file/fetch/144586104/realidades_1_capitulo_7b_actividad_11_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37cdc19d-61e2-42ba-8262-d4b3c9d62339/jafitagijefisisari.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_off0000eadc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADC 6052 bytes
SHA-256: 0e5264cda0c6fae8692039792c92437db1a47a836368c90008dbf40606ba48ac
font_01_sfnt_off0000ff4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4C 10540 bytes
SHA-256: 2f04a919c626a3b61b5098b118157158e410f09e0be8ed15ef6ba7a819de19b5

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