Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc7f84c546fdb9b7…

MALICIOUS

PDF

80.7 KB Created: 2021-05-13 14:58:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 8e32352ffdd4dbb0e56c6c1fd24132cf SHA-1: 55eedcb61c7e5e21e7ebf185d519cd48d1a081f5 SHA-256: dc7f84c546fdb9b73c3af8546ae30dbe705e75675b0f6baeaacef3a80ed44472
156 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which are designed to appear as SEO-optimized content, suggesting a link farm or phishing attempt. The primary malicious URL identified is fokemale.ru, which is likely used to host a phishing page or download a second-stage payload. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 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.
  • 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://fokemale.ru/strik?utm_term=why+is+my+sky+remote+volume+not+working PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4448547/normal_60463fc2efb4c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413838/normal_5ffcbf40b553e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460968/normal_6034d3a6af45d.pdfIn PDF document text
    • https://sajabewegapin.weebly.com/uploads/1/3/4/5/134592402/wogudidinubaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413120/normal_6064e53528c05.pdfIn PDF document text
    • https://xidiziwuzubiwon.weebly.com/uploads/1/3/4/6/134653180/7b731256429.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/towakog/mebobefivotusene.pdfIn PDF document text
    • https://s3.amazonaws.com/wusone/segoraxex.pdfIn PDF document text
    • https://s3.amazonaws.com/kovezux/89110890458.pdfIn PDF document text
    • https://8c4778c4-ed17-4cf1-86f9-5448e21c5c15.filesusr.com/ugd/6da380_e91242ac086049abbe387c8082d17ca2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/27e0d5ce-5cb0-4fd4-8095-8359091de0c9/ralebenagipizojimepikezur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57a2307d-f27a-4fe3-b01a-ca7b356e85f3/fuvudufovupu.pdfIn PDF document text
    • https://d89a15f7-21b5-45f0-b9b4-bc5b7be68842.filesusr.com/ugd/18e821_5751fa67965047ed9e61cfb23d9daec8.pdf?index=trueIn PDF document text
    • https://9e77dbea-16d6-438e-9859-4a68c5388828.filesusr.com/ugd/3225da_e31fab99b47141dfab6fdac54350f091.pdf?index=trueIn PDF document text
    • https://790985df-dfec-4a08-b509-00f37668cf87.filesusr.com/ugd/a421e3_f530364a2ad4474bab708f1df2746da4.pdf?index=trueIn PDF document text
    • https://ec2d952e-5494-46d8-b841-fee222248b17.filesusr.com/ugd/9713d5_e5c90de5e0bf41c2980e7d59439ca8e5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b1f2586-35f1-4d0e-940f-7c04bbfcd22b/14969367346.pdfIn PDF document text
    • https://s3.amazonaws.com/gotitibekovi/73220214763.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/422308e9-0a61-47ce-adad-c6b71dead167/balonimowitar.pdfIn PDF document text
    • https://5405d108-7f1e-482b-a10c-e06f62b7505d.filesusr.com/ugd/d941b1_1a3813d921d24c74b71cabafd6bf5a71.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sifawekujiki/application_form_for_usa_lottery.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e5869fc-0d23-4f71-aa6a-6193618dbba1/tatezidajadefexoworo.pdfIn PDF document text
    • https://39c10a3a-92c6-412a-a1bb-b8a1fc48fbc4.filesusr.com/ugd/259099_979230945f5442d39e978abfb94ace30.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_off0000fc51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC51 5220 bytes
SHA-256: f95eabb9e0a85f464c55f69030f985e2b6b39c2fa3ce42dcec5d58f8bc9d6790
font_01_sfnt_off00010e0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E0F 10892 bytes
SHA-256: f082b5e7f2a829aa1999ffc7965a24a283a75c8b241b3963fe91b66c3a1fabc2

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