Malicious PDF — malware analysis report

Static analysis result for SHA-256 796baee772720a7f…

MALICIOUS

PDF

77.8 KB Created: 2021-05-30 23:19:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: dcaefe40f2702ff0b14b6d1455825b2e SHA-1: 56b19f1086d4c6410b0bd2f7b262d95b5201ab45 SHA-256: 796baee772720a7fb6fe7fdcbc6087042939c38ddab6258589a0f89d0ab3e983
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9997

Heuristics 6

  • 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 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.
  • 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=android+bufferedinputstream+vs+inputstream PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4386597/normal_5ffa16a8f3f4e.pdfIn PDF document text
    • https://rufamuvobaj.weebly.com/uploads/1/3/4/7/134720601/b437e83.pdfIn PDF document text
    • https://vimugowome.weebly.com/uploads/1/3/4/3/134323071/fe43e.pdfIn PDF document text
    • https://fufiwixafuwisu.weebly.com/uploads/1/3/4/7/134770326/468822.pdfIn PDF document text
    • https://ragevixaduwoper.weebly.com/uploads/1/3/4/4/134443655/9183518.pdfIn PDF document text
    • https://jugusunoju.weebly.com/uploads/1/3/4/6/134625161/nuvijivo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379032/normal_5fec4c861683f.pdfIn PDF document text
    • https://vajasefa.weebly.com/uploads/1/3/4/4/134490273/vegunexari.pdfIn PDF document text
    • https://voxonororipesap.weebly.com/uploads/1/3/5/3/135383222/8516330.pdfIn PDF document text
    • https://javumegibevi.weebly.com/uploads/1/3/4/6/134634398/kijujakogetilob_setefe.pdfIn PDF document text
    • https://vedefagam.weebly.com/uploads/1/3/0/8/130814874/8ef9bfd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476751/normal_604cbbf335454.pdfIn PDF document text
    • https://terovudomam.weebly.com/uploads/1/3/1/4/131406893/1012f62f012.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415754/normal_605906e63f810.pdfIn PDF document text
    • https://xopaluwejur.weebly.com/uploads/1/3/1/8/131857284/winoluk_riletusododoza.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/ccfe3e57-f801-429d-a38a-e50b42cde8f4/48464737946.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/122a149d-1a49-4f2c-80a7-efa122a2e1f8/what_is_aggressive_chemotherapy_for_breast_cancer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0d7a8e8-1d5b-4ded-9105-943a349fada0/kizotovejoxod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93e1d3c7-db08-400f-b5a9-f808d93ab5d1/konica_minolta_bizhub_c224e_tonery.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c3e9ae7-4a25-4115-9f84-6878a5a2f0be/vagigakezudulopi.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_off0000e4ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AC 5344 bytes
SHA-256: 8743d7e981d48d0cdc01ba98f183bc4e617d424858257d2f037cd4291dc36415
font_01_sfnt_off0000f6c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C6 15756 bytes
SHA-256: e52418de4e799cb940cbc37aa4d3986290366339105dc33aa9b876b020a96541

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