Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0f924e0e5cc0769…

MALICIOUS

PDF

72.2 KB Created: 2021-06-08 20:56:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: a428eb6b1d81491cbb8bc60cb5b73211 SHA-1: a8d9ddcd04813c549e61b20eae9ab192f1fe7db8 SHA-256: f0f924e0e5cc07695a24f46a719f3c2e6f216c096d13a76f2e962ac04b2ab89a
186 Risk Score

Malware Insights

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

This PDF document functions as a link farm, directing users to various external PDF files hosted on disposable domains, likely as a lure for phishing or malware distribution. The presence of numerous external links and the ML classifier's high confidence score indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's part of a campaign to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://irlanc.ru/pbw?utm_term=colorful+ppt+template+free+download PDF link annotation
    • https://zibinileder.weebly.com/uploads/1/3/4/7/134748255/9c613bdb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453344/normal_60bd24bfcec0d.pdfIn PDF document text
    • https://derugipuze.weebly.com/uploads/1/3/0/8/130814861/fiferemopanejimumo.pdfIn PDF document text
    • https://dizakevusarebiz.weebly.com/uploads/1/3/4/5/134581037/4968616.pdfIn PDF document text
    • https://manoxumumaxu.weebly.com/uploads/1/3/4/4/134472756/mafit_zirevil.pdfIn PDF document text
    • https://gijogolip.weebly.com/uploads/1/3/4/7/134755622/7a4a12a.pdfIn PDF document text
    • https://fofonameg.weebly.com/uploads/1/3/4/5/134522304/2ce243c7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426972/normal_60036208751ca.pdfIn PDF document text
    • https://zezexofoji.weebly.com/uploads/1/3/4/3/134344156/lutidi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480579/normal_606210d5d47a3.pdfIn PDF document text
    • https://gutasoleniv.weebly.com/uploads/1/3/4/4/134481560/434e3cc8272.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378386/normal_606030fea29db.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/fb5e24ed-5efe-41b6-85f2-af04a805985b/kudevisazelopijuje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f4821a2-4534-48d3-b0ef-ed071ef36d9b/flir_one_lt_pro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd5b12a1-8a52-4a56-8df8-671113f09a58/dell_latitude_e6430_review_youtube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d82e950-f4ce-444d-8af2-fca5a2eb04b1/how_to_use_essick_air_humidifier_bacteriostatic_treatment.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b301800-00ea-4c7a-b221-20eba0927efb/what_is_the_difference_between_dyson_motorhead_and_animal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8dff7d5-4149-47e3-8e9f-95284046da3f/77722342355.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a44fd59b-beb8-43be-a0aa-e61d79f88944/amazing_spider_man_comics_worth_money.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_off0000ddc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC1 5004 bytes
SHA-256: 17cb1cfe3bae9379f7f3b4960a081312d4f468be934737cb34dce03ba8b45f64
font_01_sfnt_off0000eebb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBB 10680 bytes
SHA-256: 6468a6359cf1ccaa6bf570dd348f4a5f1d31cf2771b7dcd9166f0c17a73c8c5e