Malicious PDF — malware analysis report

Static analysis result for SHA-256 44f5487ed5381cff…

MALICIOUS

PDF

78.6 KB Created: 2021-03-06 00:07:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: ea2ccddff33985e66a6ece92eb3b16c7 SHA-1: cc726f3ffcb4503d376364dd84cc4c821d8210c4 SHA-256: 44f5487ed5381cff62a678da5fa193a2cc1fde284cc3517e238cc77d278d8474
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for distributing further payloads or conducting phishing. No scripts were extracted, but the PDF structure itself is designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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.
  • 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://pelibifir.ru/aws?utm_term=las+chicas+de+alambre+libro+completo+descargar PDF link annotation
    • https://renudufodajofi.weebly.com/uploads/1/3/4/8/134884992/galerikamulufugi.pdfIn PDF document text
    • http://vijexibat.mywebcommunity.org/do_charcoal_drawings_sell.pdfIn PDF document text
    • https://fozogefijegajor.weebly.com/uploads/1/3/1/4/131453134/1232276.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482009/normal_5fed9bae24a0a.pdfIn PDF document text
    • http://wejuzofibab.medianewsonline.com/how_to_buy_a_convenience_store.pdfIn PDF document text
    • http://befotuke.mywebcommunity.org/rii_mini_wireless_keyboard_with_touchpad.pdfIn PDF document text
    • https://veximukexapi.weebly.com/uploads/1/3/0/9/130969798/aa65133caff1a4e.pdfIn PDF document text
    • https://detawokigar.weebly.com/uploads/1/3/1/4/131453745/8029047.pdfIn PDF document text
    • https://kumobavogi.weebly.com/uploads/1/3/2/3/132303339/bivojevumekul.pdfIn PDF document text
    • https://zutomivopisi.weebly.com/uploads/1/3/6/0/136051870/lotomabegejorul.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502906/normal_60000e200a2ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402504/normal_600eb71b7d0ab.pdfIn PDF document text
    • http://zoguponuwuxoli.medianewsonline.com/vufidabadetika.pdfIn PDF document text
    • https://dusonibegoxat.weebly.com/uploads/1/3/1/3/131380688/vokakazoko_jenosililaf_wotovizavadaj_gaketolom.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/74c7f045-33dc-40ce-a976-25797b71fa92/ranalolopodadaw.pdfIn PDF document text
    • https://s3.amazonaws.com/juliziwojatige/musudefudadezidigu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89962f53-b5ab-46e1-b001-c90e1caea73b/42564850610.pdfIn PDF document text
    • https://s3.amazonaws.com/tasufagijaremo/wirumotorosam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea6ffa28-c92f-4c7a-802e-6feda34b9418/notumodito.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_off0000f117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF117 5568 bytes
SHA-256: bcbd0dd979b1bb4dfe907263608add90679212034c6f7b7a31cd64aa8a97d93d
font_01_sfnt_off000103cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103CC 12172 bytes
SHA-256: d0ede77357e015a3dc20c6232227d7e54554c6ce46d331285861f8679d4e5f4d