Malicious PDF — malware analysis report

Static analysis result for SHA-256 a90d5d7d20ef050b…

MALICIOUS

PDF

78.5 KB Created: 2021-04-19 00:34:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 04e1e689e86e0e366ce3ff86e56e4270 SHA-1: a4f525694b083e482e641b22b4a3440cedacc0f2 SHA-256: a90d5d7d20ef050b1afdae6e6c99e705057f6b5d29be2e8e1b2d7497734b3429
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a trojan. Although no scripts were directly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://jacksth.ru/strik?utm_term=ios+12+app+development+essentials+pdf+free+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4496585/normal_605ff17cced19.pdfIn PDF document text
    • http://eushopvmn.site/drawing_parallel_and_series_circuits_worksheet19qn2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408324/normal_6049dc2a207c1.pdfIn PDF document text
    • http://sk-anker.ru/734827671020xx70.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480756/normal_5fcedb55941fa.pdfIn PDF document text
    • http://kernig.online/how_much_model_3_costk9iq2.pdfIn PDF document text
    • http://nipokaxa.getenjoyment.net/88319872950.pdfIn PDF document text
    • http://uscarins.info/how_to_uninstall_audio_drivers_and_reinstall_windows_10qdr1f.pdfIn PDF document text
    • http://nonowun.mywebcommunity.org/radexudusupotadekal.pdfIn PDF document text
    • http://wwbook.org/39057286475idbcw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407304/normal_5ff027994bcdc.pdfIn PDF document text
    • http://bcpzonasegura10beta-viabcp.com/28128095294jl43.pdfIn PDF document text
    • http://wildber.store/40281255417n0n0z.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/gofilafixu/71578561471.pdfIn PDF document text
    • https://ca108e69-7b6b-43f0-8f16-d96ebeb8a33d.filesusr.com/ugd/79e0dc_6c41b11be96b40b7b1e26805fe049cc6.pdf?index=trueIn PDF document text
    • https://0816b8db-db6e-4af9-a106-1766ff0f8d73.filesusr.com/ugd/06e6c8_9b84cf5598424bf3b0628c74dc67bda5.pdf?index=trueIn PDF document text
    • https://874ffa1c-547c-40bc-81f8-616d05536b36.filesusr.com/ugd/5ecadc_974898bc42cf4dadb5958f935cf37f10.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/foneniz/kabupagaturog.pdfIn PDF document text
    • https://e4fb9bf1-a3d6-4767-9bf2-2a1021e5dc09.filesusr.com/ugd/53cfc7_153e02a78115437681a3f7f594bc5b5b.pdf?index=trueIn PDF document text
    • https://f9a132f0-acc9-4761-b7d8-38025aedd849.filesusr.com/ugd/5c71d6_08e4db74483d4f8990302cac5082e008.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_off0000f3a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A6 5460 bytes
SHA-256: 2677a78af50ebc8e0e4dbc81211c9e1b3ec4a27516fd715f9bb6061437635966
font_01_sfnt_off00010640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10640 10696 bytes
SHA-256: 3c96c9b9fea135e673b7e0e3460af3cc90d2e8cd96b61ad1404127ccb59175c3

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