Malicious PDF — malware analysis report

Static analysis result for SHA-256 948809703a63fc28…

MALICIOUS

PDF

76.7 KB Created: 2021-05-18 18:34:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: f161bda0c043b7f4ef315a0032143294 SHA-1: 05dc5f32ef1d9044cee9764d723a2a868e3f005f SHA-256: 948809703a63fc28358a61e7fc3d5dbbf83d187a2161b8afac4e831080727b81
214 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://yafferge.ru/strik?utm_term=caracter%25C3%25ADsticas+de+las+fotograf%25C3%25ADas+a%25C3%25A9reas+pdf'. Additionally, it features a PDF link farm with 30 external links, many of which are benign but one points to a potentially malicious S3 bucket URL. The ML classifier and ClamAV also flagged this PDF as malicious, indicating a high likelihood of malicious intent, likely related to phishing or 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 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=caracter%25C3%25ADsticas+de+las+fotograf%25C3%25ADas+a%25C3%25A9reas+pdf In PDF document text
    • https://tuzakalo.weebly.com/uploads/1/3/4/4/134492431/74b933fd1fcbb.pdfIn PDF document text
    • https://liziruji.weebly.com/uploads/1/3/4/3/134380663/6124287.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454684/normal_6023e48a8bd8d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377925/normal_5ffabf5fbd249.pdfIn PDF document text
    • https://xexiroxenokela.weebly.com/uploads/1/3/4/6/134613030/fonogolit.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/satedafadusizo/dubofakiwezurise.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55791c86-1cae-4715-82db-c89863d140ad/40643718096.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f71557b-1309-4e32-8420-784e4fabe64d/36179581143.pdfIn PDF document text
    • https://s3.amazonaws.com/ziwuvijevo/napoluwuwaxu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c186aaa-1634-49f1-bb79-138a9ce2764e/30324377450.pdfIn PDF document text
    • https://s3.amazonaws.com/dusubonifu/technicolor_router_installation_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/xarojapi/singer_4423_handbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/891cb366-734b-40ac-881e-654e3368ed53/pugazarobigazeg.pdfIn PDF document text
    • https://s3.amazonaws.com/wefadep/barcode_scanner_for_android_phones_free.pdfIn PDF document text
    • https://s3.amazonaws.com/xixonu/temple_of_sethraliss_mythic_entrance.pdfIn PDF document text
    • https://s3.amazonaws.com/folexapurilowe/karan_arjun_film_hd_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/napoledunadigo/mufiwexavo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d594d433-16f7-448f-b378-47903c9f2f6f/widakolo.pdfIn PDF document text
    • https://s3.amazonaws.com/laginekux/tawuvegojilafelopajutug.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_off0000e9a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A1 5424 bytes
SHA-256: deb79ce2f1712c4f22b975ef54bcc385f9f8ba59ef07697b9e9277faa22c3959
font_01_sfnt_off0000fbdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDB 12228 bytes
SHA-256: ceba0d31ad7a77f7c0de8d956f8be7f6dbf4a303cd8c0a1e3487df8e1af3ff7f

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