Malicious PDF — malware analysis report

Static analysis result for SHA-256 05b5899426056040…

MALICIOUS

PDF

87.7 KB Created: 2020-12-26 15:05:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 0acc7d2515c9a69537850a75730c400f SHA-1: b4092aca4b0e9d44888c4dc3aee658f678c8f3e0 SHA-256: 05b589942605604068a33dd322ac9b83f4106df265ce3ef01e01805b9d164cb4
96 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant heuristic firing indicating a 'PDF_SEO_LINK_FARM' which suggests a large number of outbound links, likely for SEO manipulation or to direct users to malicious sites. One prominent URL, 'https://trafffe.ru/strik?utm_term=build+ai+chatbot+python', is embedded and appears to be the primary lure. While no scripts were explicitly extracted, the PDF structure and the presence of embedded URIs suggest an attempt to redirect the user, potentially leading to a phishing or scam page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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.
  • 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://trafffe.ru/strik?utm_term=build+ai+chatbot+python PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4385009/normal_5f9c7b5bb8536.pdfIn PDF document text
    • https://wemibevufiwoseb.weebly.com/uploads/1/3/0/8/130813314/xesarujolaguboseda.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/b65d7615-1ed7-4975-b7b0-34281c17c7cc/prudencia_in_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3674cd30-90fc-4f45-bc19-84acbe91d257/sony_icd-px470_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e7a657e-bf58-48e9-9505-cbe981a9d798/18511743581.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxime/56242013841.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9c7d216-29e9-4210-acf7-587c14247696/suvewulaxovixowapo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/338aeb0e-c49e-4e2c-a7bc-bb15941dd6ef/homer_jr_high_pto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef25b49d-0c87-4298-b1ea-1bf74e51b7f9/dilizojexejisukeviw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a3a93f9-6eb8-413a-9250-7bc783713a0e/famowudukajidativezuma.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e76a9704-3f32-4f90-8d11-e29696dc3e52/kinematics_motion_graphs_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5be639a-2087-4ef9-ae5b-aea049244afe/cats_vs_pigs_battle_arena.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3992e70-b73a-4edd-8f74-451f20536fc1/10510941006.pdfIn PDF document text
    • https://s3.amazonaws.com/legesiliv/ubuntu_iso_image_for_vmware_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51b35787-3fd2-4171-98d1-90bf4d8380a9/18953107583.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3b7b892-9fef-46bd-9ae3-3433da534e92/20501436308.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10731 4944 bytes
SHA-256: 785cec061dea88d51b6aec2f5734c83465c3bca816d7b7b9bf46ac99d5d60b64
font_01_sfnt_off000117eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117EB 13192 bytes
SHA-256: 305a90a7b3cda8b57aaabbeca91b17d74ff7ec78226b6103fd2ecf601230d2cf
font_02_sfnt_off00014374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14374 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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