Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f10db529faa8c9e…

MALICIOUS

PDF

69.8 KB Created: 2020-11-24 15:43:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: feea1627486f13f80c5a431591c4f70c SHA-1: b913b83db7a9fa8868006e5470ac2acf79ae2a66 SHA-256: 8f10db529faa8c9e4ffcebe18e658887e27ade1cabd015b5bedc6393a3aced7c
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, many of which point to disposable hosting and redirectors, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, with the primary goal being to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/strik?utm_term=t9+horse+guide In PDF document text
    • https://simisidexibasu.weebly.com/uploads/1/3/4/5/134502995/1451678.pdfIn PDF document text
    • https://wenilitedosi.weebly.com/uploads/1/3/4/3/134315728/2571515.pdfIn PDF document text
    • https://vujedivu.weebly.com/uploads/1/3/4/7/134768767/mazuxuriv-lezaw-bofiwisuto.pdfIn PDF document text
    • https://notaxivarem.weebly.com/uploads/1/3/4/6/134633458/8099d463dd083bc.pdfIn PDF document text
    • https://zebamejiwan.weebly.com/uploads/1/3/4/3/134312785/wajutode-saxibeb-wunavabi.pdfIn PDF document text
    • https://gikudinok.weebly.com/uploads/1/3/4/7/134730402/ab9789ccd06.pdfIn PDF document text
    • https://vonubaxuted.weebly.com/uploads/1/3/1/4/131452839/8054379.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kudufigunabi/17296719434.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29a02703-4f0c-4b66-ab7a-625e9ef5b76d/14783348945.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0dcc1c4a-6c3f-497a-9f16-4c925c903bb9/12754521832.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2cf10b2-95a5-4e41-8f08-7b7252a0578c/silenurujepalepafuzikav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55a2d8dc-33e2-4335-a34a-7be07270e42a/morse_4300_sewing_machine_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a1c7286-b74f-498f-a58e-3974ee1e5c92/77840088360.pdfIn PDF document text
    • https://s3.amazonaws.com/jozaponi/38783623383.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_off0000d3e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E2 4952 bytes
SHA-256: 7e14385d49b94622f2736b9f15ac061d965fe40e51fa600c9a84449e84c75304
font_01_sfnt_off0000e4b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B5 11044 bytes
SHA-256: e677a98375440d077fc674ccc6043a05eb1e13e51df4684b6c285a138422852e

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