Malicious PDF — malware analysis report

Static analysis result for SHA-256 a891b5701f42e15e…

MALICIOUS

PDF

82.7 KB Created: 2021-03-22 00:11:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 6f30da47e5445566f35ec2606011b60e SHA-1: 2a27fa61ab6df3c3c42a04f007ace0ca3e2659bf SHA-256: a891b5701f42e15e4bc629d28391871ffce4f4cbd386cfe4d25136a8edb52fcd
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains a large number of external links, suggesting a link farm or redirection to malicious content. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external URIs indicate a potential for exploitation or phishing.

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://jacksth.ru/award?keyword=cardiac+amyloidosis+treatment+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4464330/normal_5fe987a1dffab.pdfIn PDF document text
    • https://cdn.sqhk.co/fofateze/phbyji8/gofutinijone.pdfIn PDF document text
    • https://cdn.sqhk.co/kugefiruxat/ggciaxd/80222324599.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460228/normal_6030fb8e40432.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375209/normal_6015548693fd8.pdfIn PDF document text
    • https://jakuvuwokuguges.weebly.com/uploads/1/3/4/8/134891264/4067259.pdfIn PDF document text
    • https://cdn.sqhk.co/sobexofap/ixWVeDb/60052246832.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490265/normal_60515996e55d0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455376/normal_6004faf038906.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409604/normal_6057c227aa0de.pdfIn PDF document text
    • https://degexaxi.weebly.com/uploads/1/3/1/4/131406510/vifinas.pdfIn PDF document text
    • https://cdn.sqhk.co/bolukawet/jdjiqjj/between_the_sheets_mangapark.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484624/normal_600f986c52a4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477864/normal_5fe87f65e9d62.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422640/normal_601d4ddd56e92.pdfIn PDF document text
    • https://gasuzenop.weebly.com/uploads/1/3/4/2/134266144/9584013.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/762f7ee3-7d9a-4d42-99cf-3ba6a861be23/sangean_wr-22_remote_control.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fd0423b-a1d4-4fc9-b2c6-890d79e3c08c/what_is_the_peo_model_in_occupational_therapy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/643e33b8-a2c9-4e3f-ba4f-a1953c3a345a/what_is_36_months_old_in_years.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8f94169-d1cc-4d03-af10-98b2fe8b4f64/what_is_a_quantum_leap_in_physics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8a8670a-7082-4eec-9931-af3a0e4d35b3/86912456592.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_off000107f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F7 5308 bytes
SHA-256: 75f510f03c158f3d24d5309ebdfa214b5405bcc991a0a80aa2e9fe06a4e57bfb
font_01_sfnt_off000119f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F9 10444 bytes
SHA-256: 82dce2982147786a4f0a8821ddc3720f5a26a261abb11333674add46f1cae6ab

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