Malicious PDF — malware analysis report

Static analysis result for SHA-256 282535c7779d1126…

MALICIOUS

PDF

77.2 KB Created: 2021-05-20 22:47:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 857447d2fa4343dc4c79dd8ef7549609 SHA-1: 21a7074988e100c84654d4e22980aab7e060fcc7 SHA-256: 282535c7779d1126fcfa51e56f7de0ffa61d8f47b3b0af17fd5f796d738c041e
204 Risk Score

Malware Insights

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

The PDF file contains numerous external links, suggesting a link farm or phishing attempt, and is flagged by ClamAV as Pdf.Phishing.Trojan. The presence of a security bypass instruction to disable antivirus further indicates malicious intent. The document body, though heavily obfuscated, contains keywords related to free downloads, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://resalured.ru/strik?utm_term=marvel+super+heroes+2+free+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4423189/normal_601a08c930580.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500897/normal_5ff5eb9f20a4a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476126/normal_60462851bc43e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498678/normal_5fc81cd759c68.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484126/normal_60619f382a9f1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417536/normal_60001f6338952.pdfIn PDF document text
    • https://kelebewo.weebly.com/uploads/1/3/4/3/134359650/fexomuka.pdfIn PDF document text
    • https://boxuvudadutubip.weebly.com/uploads/1/3/2/6/132695546/5e3d61f0f2d6101.pdfIn PDF document text
    • https://bemofoserobonuw.weebly.com/uploads/1/3/0/7/130739893/buxaxe-zuxuz-mejikofuregofo-jifuvezadad.pdfIn PDF document text
    • https://pelimabogex.weebly.com/uploads/1/3/4/6/134685965/pafabipadun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422144/normal_604699c69f3df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366005/normal_604a99b9618c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443610/normal_6013b9be18a53.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489412/normal_602c5e636274d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448558/normal_602b7fe50d78c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488133/normal_603163ee0932f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370764/normal_603525e4b9292.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404503/normal_6015a5497754f.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/35196e61-7ee7-4c43-8d3a-257e92751db3/nusum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60182338-0f61-402c-a4e9-0d2f0c89364c/how_much_does_a_detective_get_paid_in_canada.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_off0000ec56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC56 5416 bytes
SHA-256: b916e10a63ef0d6a7d813cbc49af19531f4a18ec61c2567dbaed1eda2214176c
font_01_sfnt_off0000fee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE1 11964 bytes
SHA-256: 069969fe68c2bb1a9587782bbb322e101b2496a3c2631910d4896a16f78fb54f

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