Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a74b565661cd20e…

MALICIOUS

PDF

71.2 KB Created: 2021-01-30 15:58:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 5f1405b9f06b8ad7a761d88bd55271cf SHA-1: 225a3c1277a6b710bd105d0a453e9dc9e97c3441 SHA-256: 1a74b565661cd20e1a6c6237882c4c3f86277f08230cecf1c1f42aaafd535c5a
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to disposable domains or redirectors, indicating a phishing or malicious content distribution attempt. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags a link to 'yafferge.ru' as malicious. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest an attempt to redirect users to malicious infrastructure, likely for credential harvesting or further malware delivery.

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 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.
  • 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/aws?utm_term=chillara+devullu+naa+songs In PDF document text
    • http://drovazvenigorod.ru/zedgetm_ringtones_and_wallpapers9xyc5.pdfIn PDF document text
    • https://vonosupaxeme.weebly.com/uploads/1/3/0/7/130740497/zosuxetusujozed.pdfIn PDF document text
    • https://gepajalubawif.weebly.com/uploads/1/3/5/3/135326746/limomuzuw.pdfIn PDF document text
    • https://guzepebizosi.weebly.com/uploads/1/3/4/8/134880367/5515824.pdfIn PDF document text
    • https://xavodumofas.weebly.com/uploads/1/3/4/9/134901052/xolukaripivukifofu.pdfIn PDF document text
    • https://buwuwewofopalun.weebly.com/uploads/1/3/4/0/134097592/fajalixo-munow.pdfIn PDF document text
    • https://labopepiw.weebly.com/uploads/1/3/4/7/134747507/bufiwa-gotimugebate.pdfIn PDF document text
    • http://nofovukad.iblogger.org/castaner_espadrilles_size_guide.pdfIn PDF document text
    • https://bupafenanibud.weebly.com/uploads/1/3/4/0/134042845/pobopubenepojiwe.pdfIn PDF document text
    • https://ravijirigiraga.weebly.com/uploads/1/3/4/6/134649302/754136.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/xufujofaleki/fuzotadoxezowufitirifimep.pdfIn PDF document text
    • http://wurunuj.epizy.com/fovukurerivoduzurisuse.pdfIn PDF document text
    • http://texatutegelemov.rf.gd/10156642451.pdfIn PDF document text
    • https://s3.amazonaws.com/ropuba/baskerville_italic_font_free.pdfIn PDF document text
    • http://kanisal.epizy.com/blades_of_brim_mod_apk_unlimited.pdfIn PDF document text
    • http://xowepiguxuwo.epizy.com/free_wedding_budget_excel_spreadsheet.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_off0000d8d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D4 5052 bytes
SHA-256: 2ecfccb810eb66a040e09d000808a6898666b1334ed9c2e128114d6ef7c60be9
font_01_sfnt_off0000e9fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FD 11136 bytes
SHA-256: 9007f1b3cc51248d7babfef5ad898fe62e67d7c413263e5a5493ce728d3547e4

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