Malicious PDF — malware analysis report

Static analysis result for SHA-256 55af39a16a208f2b…

MALICIOUS

PDF

73.7 KB Created: 2021-02-23 21:57:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: f6cdf20aba5270a25b8260a7072fd2b0 SHA-1: d8207d41d184103553d1c49d5747ccc305f2ea07 SHA-256: 55af39a16a208f2bded58c886bb24169a858f8e9e1b57b06a4f70385f175180c
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for phishing or distributing further malware. The heuristic PDF_SEO_LINK_FARM specifically indicates a large number of external links, suggesting a link farm or a phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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
  • 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://bologen.ru/strik?utm_term=hp+officejet+7110+colour+inkjet+printer+a3 PDF link annotation
    • https://fibutoledul.weebly.com/uploads/1/3/2/7/132741024/3890045.pdfIn PDF document text
    • https://nurafotupitu.weebly.com/uploads/1/3/4/4/134495453/rukikuven-jopijo-xazam-wodelaxepixu.pdfIn PDF document text
    • https://pebepatesova.weebly.com/uploads/1/3/4/4/134447190/9f38b.pdfIn PDF document text
    • https://zevuvizaxetu.weebly.com/uploads/1/3/4/8/134887967/8183070.pdfIn PDF document text
    • http://godumos.22web.org/deep_learning_slides.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lijizuzinarit.epizy.com/hatha_yoga_sequence_for_beginners.pdfIn PDF document text
    • http://dafunidubavilo.rf.gd/13579123240.pdfIn PDF document text
    • https://s3.amazonaws.com/senodiw/32825751208.pdfIn PDF document text
    • https://s3.amazonaws.com/fekife/english_language_conventions_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/jujadodedaruxix/22774477262.pdfIn PDF document text
    • http://fuluwaf.rf.gd/search_bar_in_google_map_android_example.pdfIn PDF document text
    • https://s3.amazonaws.com/sosupejuxofedo/gobeteferizobavu.pdfIn PDF document text
    • http://fizuxobitunoge.epizy.com/jubimi.pdfIn PDF document text
    • http://gutumafik.epizy.com/16135814804.pdfIn PDF document text
    • https://s3.amazonaws.com/vinivuxo/85611523920.pdfIn PDF document text
    • http://wabeworozad.rf.gd/vabopakafobesozevorif.pdfIn PDF document text
    • https://s3.amazonaws.com/pevuwarobuvowa/11476785669.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE321 5372 bytes
SHA-256: 2ac353ac29f7cf4f21fb71c1e04142d5b048ef3db9a7d21ca615e9b8a30738bb
font_01_sfnt_off0000f595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF595 10648 bytes
SHA-256: ac630eefa825a9115e5dd3e564c9045f849f9b7090e956990f6a6317dd9d104e

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