Malicious PDF — malware analysis report

Static analysis result for SHA-256 f01ae0c2046f8755…

MALICIOUS

PDF

81.2 KB Created: 2021-03-22 12:19:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 61e96f4d96b5840941d90c94f78078a7 SHA-1: 5f2074227d6e5cd5442bb67dcac06b167c301081 SHA-256: f01ae0c2046f87559b6441b51e7503b50591127799559a1832b8cc7c163d17d4
244 Risk Score

Malware Insights

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

This PDF file functions as a link farm, containing numerous embedded URLs. One of these URLs, https://dafemum.ru/strik, is identified as a malicious redirector, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • 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://dafemum.ru/strik?utm_term=the+mysterious+benedict+society+tv+series+cast In PDF document text
    • https://cdn-cms.f-static.net/uploads/4455208/normal_600d88429912f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481408/normal_5fe2c225a684a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381962/normal_601ecc24e5483.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457854/normal_60428a3aa2e10.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490974/normal_602934dbcc7cd.pdfIn PDF document text
    • http://xomaweluk.22web.org/79562586365.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385214/normal_60076eddd058e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367311/normal_5fe194ec735b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454973/normal_6044761209a6c.pdfIn PDF document text
    • http://jetavimazi.22web.org/64807075378.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://711a90e7-97f2-4eab-8690-3003ec1e9b64.filesusr.com/ugd/a0905b_7c7c7621a8d54d0d8438fdc182f811de.pdf?index=trueIn PDF document text
    • https://74269c25-1731-4359-90d4-804f54ef9c1c.filesusr.com/ugd/b5973a_1bd7d9e0cc8040e9aab0fa0f6f439e9c.pdf?index=trueIn PDF document text
    • https://f1c0478e-57b3-422a-b8eb-433964b677d2.filesusr.com/ugd/16c17d_077169f7682e44e4aa9e08cab7576bdc.pdf?index=trueIn PDF document text
    • https://0926596c-b1e6-4473-87d6-fed2e709bfeb.filesusr.com/ugd/e2a635_793d0a51288a47d28916b774ed111bbd.pdf?index=trueIn PDF document text
    • http://tokeximu.epizy.com/arduino_mini_pro_pinout.pdfIn PDF document text
    • http://zelimasiropaf.epizy.com/96541082469.pdfIn PDF document text
    • https://c183b790-cb34-49aa-848e-1a9f2b14dda3.filesusr.com/ugd/d8966e_6c255619254d4d9abdcdb11134ba0498.pdf?index=trueIn PDF document text
    • https://db532842-334f-4efb-8993-e67ec8f20ff5.filesusr.com/ugd/bc5be3_b9a01d3b9eae4e9386c143b836679b19.pdf?index=trueIn PDF document text
    • https://937a8a2d-b41a-4163-aff8-eda6db263557.filesusr.com/ugd/21e6f2_f773cb9fd886499d8cce1d972c275d07.pdf?index=trueIn PDF document text
    • https://5f384421-c3d0-4b4c-85a6-d3745974446f.filesusr.com/ugd/40006b_436fa7b5ab9d4238b26a6008e4ddc4a9.pdf?index=trueIn PDF document text
    • https://435a888a-8f80-410d-aa77-77edd6e4491d.filesusr.com/ugd/51fec0_9cd17b6afdb844fe844b6bacdd088ad9.pdf?index=trueIn PDF document text
    • https://cf4de027-7369-46c2-bf93-d69cabef2b5e.filesusr.com/ugd/868b90_8ea02eb77dba4827a863668f74e951d8.pdf?index=trueIn PDF document text
    • http://rolaxaja.rf.gd/why_is_my_oil_heater_clicking.pdfIn PDF document text
    • https://d89a15f7-21b5-45f0-b9b4-bc5b7be68842.filesusr.com/ugd/18e821_a138d705cde14588b1ce49fc2a870b7d.pdf?index=trueIn 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_off0000ffd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD3 5400 bytes
SHA-256: 225497e1b61e9e64227cb95ede18734f900510bb2647c93690b7f78e44e027ba
font_01_sfnt_off0001120b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1120B 10964 bytes
SHA-256: bee49a64916a17c236ec652325b0ae05bfbcdbb5f3fd4b45beeedb5c1c145ff8

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