Malicious PDF — malware analysis report

Static analysis result for SHA-256 5071386aa60346c7…

MALICIOUS

PDF

99.7 KB Created: 2021-02-11 06:54:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: ee2df39752ea62ba344fdff69bf562ff SHA-1: 19bb2776e114208c8db1f357ef471aa6b84b906e SHA-256: 5071386aa60346c773da230dceb8b2245f0e56263e464026983f2fe52eef6713
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a malicious intent to redirect users to potentially harmful sites. The ML classifier and ClamAV detection strongly indicate malicious content. While no scripts were directly extracted, the PDF structure and numerous URLs point towards a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/123?utm_term=oxygen+not+included+auto+sweeper+farm PDF link annotation
    • https://cdn.sqhk.co/samivegin/e2hhLV8/95240965272.pdfIn PDF document text
    • http://azorocheat5.xyz/gate_2020_form_requirementsd4581.pdfIn PDF document text
    • http://poroda.site/66015569494sjynm.pdfIn PDF document text
    • https://nupinowag.weebly.com/uploads/1/3/0/8/130814423/tekeram.pdfIn PDF document text
    • http://bilkan.fun/70193748900o5xk6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480758/normal_5fdf3e2fc9ba4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407983/normal_5fdd43607d8cd.pdfIn PDF document text
    • https://zapirugitoz.weebly.com/uploads/1/3/4/5/134508168/konavexened.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://netifikapiwi.epizy.com/baofeng_888s_software.pdfIn PDF document text
    • https://s3.amazonaws.com/tosevud/install_apk_android_studio_emulator_linux.pdfIn PDF document text
    • http://gusubozavagu.epizy.com/best_career_aptitude_test.pdfIn PDF document text
    • https://s3.amazonaws.com/subopukomanaw/truck_waybill_form.pdfIn PDF document text
    • https://s3.amazonaws.com/miledu/pojivo.pdfIn PDF document text
    • https://s3.amazonaws.com/sitozi/harry_potter_quiz_with_answers_easy.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_off00014881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14881 5764 bytes
SHA-256: dac9c67305ac8b228bc352bddb38014569df8ebd15e1dd4248cdd7990445f83e
font_01_sfnt_off00015c30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C30 10928 bytes
SHA-256: 445766a5461e0c6d3c61eb64b56a64fb9140af399c7c8d7e6ba7515b5d45852e

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