Malicious PDF — malware analysis report

Static analysis result for SHA-256 9431c62acfb32591…

MALICIOUS

PDF

79.1 KB Created: 2021-04-12 03:40:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 9354240878b5b192d548a350828beb9d SHA-1: 2b870ce166484d5ed4a857ce9b37241cd591941c SHA-256: 9431c62acfb32591b126492c8a0f342271ad83636ae3bf5b2db10fa1e0288320
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a technique often used for SEO farms or to direct users to malicious sites. ClamAV and ML classifiers identified this file as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://nipisod.ru/strik?utm_term=what+is+a+principal+job+title PDF link annotation
    • http://fumigatoff.online/unidad_4_procesos_de_fabricaciontdpvk.pdfIn PDF document text
    • http://manybigs.space/where_to_donate_used_toys_calgary0s475.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459483/normal_602b48e35f6a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426541/normal_6037b29084d85.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390642/normal_6056e40d17b4c.pdfIn PDF document text
    • http://mijudivoxobo.iblogger.org/towers_of_midnight_epub_vk.pdfIn PDF document text
    • http://domastmsk.space/how_to_install_netgear_wireless_usb_adapter_wg111v2_without_cdpuulh.pdfIn PDF document text
    • http://teksalle.xyz/fowodarijaw70zl.pdfIn PDF document text
    • http://dimax-matrasy.ru/bumasubawefajovekuzagaraes24d.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/sirilagewuga/nukikakorajav.pdfIn PDF document text
    • https://2903667b-e544-4972-ac7f-e5855aaa9b37.filesusr.com/ugd/2cc660_e1470d3db977423ebfedc1df4c53f001.pdf?index=trueIn PDF document text
    • https://9e1e9198-0fe7-4103-8084-fdcc6befb8d5.filesusr.com/ugd/2f7815_07cd6b4b0e43484c96f843c57c6ca3d6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fapaga/slope_intercept_form_math_antics.pdfIn PDF document text
    • https://2dcb0092-dd22-4cef-90c1-8c398f802bb7.filesusr.com/ugd/ff3115_afc435b334b24adba57420f3e463248e.pdf?index=trueIn PDF document text
    • https://0a37a3d5-a0bf-4e77-8ff5-6127fd08aefa.filesusr.com/ugd/6046c9_90d0f09268c240d8ab1064af95a868b7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bulikowexunepov/faroxebuzebi.pdfIn PDF document text
    • https://s3.amazonaws.com/tasufagijaremo/demeladololijo.pdfIn PDF document text
    • https://01477de9-116b-42a6-a62c-54244336611e.filesusr.com/ugd/dea9e9_1c29bc98bcf84c79bf2519a7fd4ffffe.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/metakibeme/imagine_dragons_demons_piano_sheet.pdfIn PDF document text
    • http://fivajopafovile.rf.gd/39716490755.pdfIn PDF document text
    • https://s3.amazonaws.com/gogonof/puzubadakesaj.pdfIn PDF document text
    • https://s3.amazonaws.com/wujanozo/cbse_maths_workbook_for_class_6.pdfIn PDF document text
    • http://dojareloz.epizy.com/27534179874.pdfIn PDF document text
    • http://jawolaguf.rf.gd/47949894629.pdfIn PDF document text
    • https://s3.amazonaws.com/rodakarugupoko/fapifowidixugupunij.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_off0000f813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF813 5248 bytes
SHA-256: 1e53672bd43667f53f1cbbc0c0195171a3f4bd34265ad30eef9113bef07c5953
font_01_sfnt_off000109f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F4 10844 bytes
SHA-256: 4d587a36c0548783e37c2a72e8506dde23cb89bfa3fb92d3259a41840f529962

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