Malicious PDF — malware analysis report

Static analysis result for SHA-256 afd677b8fcbd57d3…

MALICIOUS

PDF

76.8 KB Created: 2021-02-21 05:56:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 04014ba318691c1bc4e0b70d94569e06 SHA-1: aad37b3a6fb8f54980e89a2fbe3b72ff671ae6fd SHA-256: afd677b8fcbd57d3359e5ab6b91f937d3c0f9e4d94e6b1cad4f4295803659e3a
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a redirector and a link farm. It contains numerous embedded URLs, including a primary link to 'yafferge.ru', which likely serves as a malicious redirector. The document's structure and content suggest a phishing or scam attempt designed to lead users to harmful websites.

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
  • 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.
  • 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://yafferge.ru/strik?utm_term=juki+ddl-5550n-3+manual In PDF document text
    • http://mawifit.iblogger.org/2871555600.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424682/normal_5ff1dee59e057.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370280/normal_60103563b9f3b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368950/normal_601f56d654356.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476596/normal_5fcdf3f6c57e3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4528260/normal_5fdef2808dcd7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388293/normal_600b40ecba94c.pdfIn PDF document text
    • https://cdn.sqhk.co/moxinivo/8jetS0D/zijofokafidukukowo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375195/normal_5fdf089a09c32.pdfIn PDF document text
    • https://zukevijidogokil.weebly.com/uploads/1/3/0/7/130738647/5996664.pdfIn PDF document text
    • https://tigasuzile.weebly.com/uploads/1/3/1/3/131379741/9086485.pdfIn PDF document text
    • https://cdn.sqhk.co/toxinize/ZAhjZhj/smash_wario_guide.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456134/normal_5ffbec2d8de60.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390068/normal_5ff3cca103188.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374372/normal_60280a5744870.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://forolulazo.rf.gd/mofixopupunukexem.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e63f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE63F 2900 bytes
SHA-256: 68d094faf81d2ea9f62e68ee4e789e40b6192f27e323b9e50c58fbaa8f881837
font_01_sfnt_off0000f082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF082 5212 bytes
SHA-256: 6feca5ec30cebdd4c1e7f39c9db25a236f1de5d1e98c3272aa10d5c9e86343a0
font_02_sfnt_off0001023a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1023A 10524 bytes
SHA-256: 0073b002d357c922b0dd226d6b3230217ffb413edec339e69f842154ff51f65e

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