Malicious PDF — malware analysis report

Static analysis result for SHA-256 847e3657c6d0c2d3…

MALICIOUS

PDF

79.4 KB Created: 2021-04-06 19:12:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7cf77498e99f145ec56be8ec1fe6c10e SHA-1: 762ffe48268605e0bcc4e26c33c0c77f277a00ab SHA-256: 847e3657c6d0c2d3868ab2b21ea1224f86f16e5709f53563a36cfa4eb0111270
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one pointing to 'botokaw.ru', suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/award?keyword=east+africa+history+pdf
    • http://wivuperafuzo.mypressonline.com/que_sera_sera_chords.pdf
    • https://cdn-cms.f-static.net/uploads/4406169/normal_60415949c4485.pdf
    • http://fipizilemuwob.medianewsonline.com/a._c._a._l._m._e_s._e.pdf
    • http://kononameve.mywebcommunity.org/basic_knowledge_of_electrical_engineering.pdf
    • https://cdn-cms.f-static.net/uploads/4448100/normal_605f9e818d4b3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://2eeb51df-07ba-4372-80d9-1ef4646fc7f7.filesusr.com/ugd/6af210_6a303017ba0d4650905644023b4f966f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/3f52a44f-6270-4cf3-baef-e52193023ecb/vekiwapewajero.pdf
    • https://23da7c74-6e14-424a-b22a-901aa35eafb1.filesusr.com/ugd/9cc572_bee347ad2389479aa23f35b334402f24.pdf?index=true
    • https://uploads.strikinglycdn.com/files/58f99ca6-81ba-4c1d-afe8-dc4bbfed182c/42384803759.pdf
    • https://03df74f7-894d-4c84-999e-da2b33eb06f5.filesusr.com/ugd/4c7733_351a4339716d49939121624e6649bb15.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a7975d25-fcc4-43d0-811e-1d9b704c90d3/21837758249.pdf
    • https://28ae28a3-27cc-4d38-be83-0de1f6925f83.filesusr.com/ugd/454016_7a50bc7fb90b4cb0982ae9b96c44ebe8.pdf?index=true
    • https://99ca13e2-8bf0-45b2-93fa-bbfb519f101f.filesusr.com/ugd/5392be_fe065ef51b5b40f98d0817f33d9a9735.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c54967f3-0230-40da-8861-678329dde128/lerikidaxidibowuk.pdf
    • https://uploads.strikinglycdn.com/files/adc4b9f5-aae2-4a57-a52a-943d82e4f666/boy_scouts_store_pleasant_hill_ca.pdf
    • https://ed0f7819-48b4-4c0d-9119-93de03d81b9c.filesusr.com/ugd/e481ce_1b3a85b2e8ea47b48d5fc561976f4841.pdf?index=true
    • https://c1f973cf-d719-4acb-8f9e-cd83ae4fb94d.filesusr.com/ugd/057766_496fc39b33344cb9ae46382ab5928d6c.pdf?index=true
    • http://mixipazotan.epizy.com/caesar_2_game_free.pdf
    • https://73f4d879-981c-49fe-abc7-520f36a14a84.filesusr.com/ugd/b77b08_992d3242be7b44209b0eaca947757299.pdf?index=true
    • https://ea74ff18-003d-4094-8454-8d7e15e33abb.filesusr.com/ugd/50de67_2accd5ca1ba742af85267c2a2d51dc43.pdf?index=true
    • http://tosabukevosubar.myartsonline.com/73456507378.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed4a.bin
b6b85b20c8c76048d4c77c00eeaf1014d87732c20bf5c859c5c30c59c0264d8d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED4A 4832 bytes
font_01_sfnt_off0000fdca.bin
4f6325b5c8395a0989cd0aca0aafb4522dafbaabb2f667ac697f787cdd8aac07		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCA 10588 bytes
font_02_sfnt_off000121d4.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121D4 4324 bytes

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