Malicious PDF — malware analysis report

Static analysis result for SHA-256 d10f28ca6b9b8039…

MALICIOUS

PDF

78.0 KB Created: 2020-12-19 00:23:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 798a68512744a494e90f48b08161e0b6 SHA-1: b0492065f69d520a7404e9f15f43d263f5d43e3b SHA-256: d10f28ca6b9b8039bf5de12e8a310302c557dde2d8595b00d4c8c3d4c14d280d
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the presence of numerous external URLs and the nature of the PDF heuristics point towards an attempt to redirect users to malicious sites, potentially for credential harvesting or malware distribution.

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://trafffi.ru/aws?utm_term=don%2527+t+starve+sanity+guide PDF link annotation
    • https://fipoxojumudex.weebly.com/uploads/1/3/4/6/134649093/xozapemofuvoj-niniwidi-zepidefo-jukoji.pdfIn PDF document text
    • https://sofunidus.weebly.com/uploads/1/3/4/5/134593652/1dfd88852a845e3.pdfIn PDF document text
    • https://domuvajedoxu.weebly.com/uploads/1/3/4/8/134847007/dedojixakaki.pdfIn PDF document text
    • https://lakerevuko.weebly.com/uploads/1/3/4/6/134654656/2405894.pdfIn PDF document text
    • https://saxigixerugeri.weebly.com/uploads/1/3/4/5/134585582/bajuvurevit.pdfIn PDF document text
    • https://reredutubonuki.weebly.com/uploads/1/3/0/7/130775370/eb01b4cb7c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381748/normal_5fb27e4f7473a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416792/normal_5fc9460280a0e.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/fibaxizimudez.pdfIn PDF document text
    • https://lafadulow.weebly.com/uploads/1/3/4/5/134591129/jovikuraluzelogaxug.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/337700d8-2f80-4b16-acde-fb441b25f587/mivusefode.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41c8da93-c9e0-4871-88e1-6fc3b668464b/kefubavelemezuja.pdfIn PDF document text
    • https://s3.amazonaws.com/remufuzu/physical_examination_books_medicine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a55ef8ed-2b59-4b3e-baf3-32969c125457/bodobopojovafagepunida.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a2820bb-7309-4880-880b-32c2cc340422/liwugubik.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_off0000f43f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF43F 5156 bytes
SHA-256: 4c1e21d3a35c57f532613e8c71f79e3b9abd22c43a66382df21398a36df25dc5
font_01_sfnt_off000105f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F2 10800 bytes
SHA-256: ca268d669eec0f5fbe24d142d3a18d92030e374dbd579e22f19cb4554a6c0c66

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