Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fc9e883f33c647f…

MALICIOUS

PDF

75.8 KB Created: 2021-04-29 20:55:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: df92fd0f5ee0410a54a35a7710b275b3 SHA-1: d12e499fe90617e0898165d40a4ce079c62e70de SHA-256: 3fc9e883f33c647fa773a59c9c34a362c7d16adc44bf5a92713fdf898fcefb3d
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant number pointing to PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' indicate the document's primary purpose is to drive traffic to external sites, potentially for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://seumenha.ru/strik?utm_term=bram+stoker%2527s+dracula+movie+plot+summary PDF link annotation
    • http://gazeloguxa.22web.org/boyles_anaesthetic_machine.pdfIn PDF document text
    • https://xibabajawaxas.weebly.com/uploads/1/3/1/3/131398380/xomasinizuduku.pdfIn PDF document text
    • https://badumanonelom.weebly.com/uploads/1/3/4/0/134040969/5430494.pdfIn PDF document text
    • http://lakujalinifibo.mypressonline.com/runes_of_magic_system_requirements_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/baruduwege/ifRhawi/87341155995.pdfIn PDF document text
    • https://pimupaxepa.weebly.com/uploads/1/3/1/8/131857198/6e56db69adcab.pdfIn PDF document text
    • https://lanilemu.weebly.com/uploads/1/3/1/3/131381326/4674409.pdfIn PDF document text
    • https://pomulopegodetom.weebly.com/uploads/1/3/1/3/131384256/mitamuxalapenit.pdfIn PDF document text
    • https://cdn.sqhk.co/madilaxetevo/gdljiQj/rakcon_bsc_nursing_2019_answer_key.pdfIn PDF document text
    • https://zuvigopujipo.weebly.com/uploads/1/3/0/9/130969218/ff7194.pdfIn PDF document text
    • http://zomixuxoluzijum.mywebcommunity.org/injection_surjection_et_bijection.pdfIn PDF document text
    • https://perasukene.weebly.com/uploads/1/3/4/6/134644841/5061703.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/tinezedu/legeguxasivun.pdfIn PDF document text
    • https://s3.amazonaws.com/meludav/what_are_some_positive_feelings.pdfIn PDF document text
    • http://zajegugolex.epizy.com/bizoragokasavefuk.pdfIn PDF document text
    • http://rinimodosejowuf.myartsonline.com/69163625618.pdfIn PDF document text
    • https://s3.amazonaws.com/bifamomove/99461006645.pdfIn PDF document text
    • http://susesibukof.epizy.com/video_player_apk_free_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/fobupojowojon/vuwadukidikifubibo.pdfIn PDF document text
    • https://s3.amazonaws.com/dorobukasawituw/breastfeeding_alcohol_guide.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_off0000eb3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3D 5528 bytes
SHA-256: 1671d0f6f219518a78557ade2ef0da92d1b2f5175a688ed9e56057052018a2c4
font_01_sfnt_off0000fe0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE0F 10596 bytes
SHA-256: 0f77fc6eb8d8bffd5d99ff0b4aad468ab8ce3a6a9b914404951677b7b66ca73b

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