Malicious PDF — malware analysis report

Static analysis result for SHA-256 5512d9b7e7631731…

MALICIOUS

PDF

64.9 KB Created: 2021-01-10 04:05:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 5816edfa075ff8faa97b935a8d9d7a22 SHA-1: 9accf8c69abed3dc9ddcc1bafd5051f432a8e74b SHA-256: 5512d9b7e76317318f70495b4f6dc87f83625d409ce21c0cd7b1f1256bfe9a00
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious and likely phishing-related. It contains a large number of external links, many pointing to PDF files hosted on various platforms, suggesting a link farm or content distribution mechanism. The presence of embedded URLs and the overall structure indicate an attempt to redirect users to malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://trafftec.ru/aws?utm_term=bruel+kjaer+type+2270+manual PDF link annotation
    • https://bakukumi.weebly.com/uploads/1/3/4/4/134437371/2d62a6.pdfIn PDF document text
    • https://pipovako.weebly.com/uploads/1/3/5/3/135300091/guwegewutete-kudojegi-gazemo-kepidediwadages.pdfIn PDF document text
    • https://wimugedi.weebly.com/uploads/1/3/4/7/134725841/vogakusajom-morokaxube-jopikujum.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498994/normal_5fcb591c8278d.pdfIn PDF document text
    • https://texifuxifom.weebly.com/uploads/1/3/0/7/130776695/nudexaguwibupozowef.pdfIn PDF document text
    • https://viweposedijul.weebly.com/uploads/1/3/1/0/131070314/vafiv-pajiwukazuji-zomabid-lelaruzebe.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/tudawufed/gusuliteligutivasoj.pdfIn PDF document text
    • https://s3.amazonaws.com/wenobagupexekap/development_economics_debraj_ray_solutions.pdfIn PDF document text
    • https://s3.amazonaws.com/xirixepo/how_to_report_malaria_parasite_slide.pdfIn PDF document text
    • https://s3.amazonaws.com/sulasatevirexo/15748204340.pdfIn PDF document text
    • https://s3.amazonaws.com/viromibukoleliw/awesome_tanks_2_unlimited_money.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_off0000c160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC160 5432 bytes
SHA-256: ba841759833fdbb9eeef1002d90b0ef5fac84eb156089eaa961bd5ed608c65f2
font_01_sfnt_off0000d3db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3DB 10420 bytes
SHA-256: 7828949062972942799e034d29e78bc78017942e0ca129ffe2e89b1eecf0cf4a

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