Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e88167449bdf9ba…

MALICIOUS

PDF

82.1 KB Created: 2021-05-11 13:02:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ea76ac26d25049f68c4feab56b83e0fd SHA-1: ac0222d1ff443af6362a7e94b911a248df8fdb20 SHA-256: 5e88167449bdf9baa070e851f8f641b7ef6874f73b91e4ad0ce2540cba251f31
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://jottigo.ru/strik?utm_term=best+chemistry+topics+for+project PDF link annotation
    • http://mavixepajifulem.scienceontheweb.net/personal_swot_analysis_examples.pdfIn PDF document text
    • http://kerutugizuxig.mygamesonline.org/asp.net_tutorial_with_c_sharp.pdfIn PDF document text
    • http://zixudivibudizu.scienceontheweb.net/63033070076.pdfIn PDF document text
    • https://gobajirosalafos.weebly.com/uploads/1/3/5/3/135392744/nejubiregarika_gumumuw_xafitepe.pdfIn PDF document text
    • http://kubosikavudux.mygamesonline.org/dbx_next_earnings_date.pdfIn PDF document text
    • http://rivepozepuxar.mywebcommunity.org/how_to_edit_my_writing.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367646/normal_60494e37a3a72.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459319/normal_605955adcf44f.pdfIn PDF document text
    • http://kesuvajeb.scienceontheweb.net/how_to_find_missing_voltage_in_a_parallel_circuit.pdfIn PDF document text
    • https://dovekawelefirim.weebly.com/uploads/1/3/4/2/134266448/7393e8cbd.pdfIn PDF document text
    • http://jedusajinud.mygamesonline.org/wheel_of_time_book_13_download.pdfIn PDF document text
    • http://mavigawika.scienceontheweb.net/minn_kota_power_drive_trolling_motor_foot_pedal_v1_foot_pedal.pdfIn PDF document text
    • https://rizipopene.weebly.com/uploads/1/3/5/3/135316145/vatepewuz.pdfIn PDF document text
    • https://fodubimofo.weebly.com/uploads/1/3/4/8/134884763/tozazavidotitulat.pdfIn PDF document text
    • https://cdn.sqhk.co/rijunawep/uegfgit/matrix_brothers_are_ladies_now.pdfIn PDF document text
    • https://cdn.sqhk.co/fodibaniwe/higjijy/3672583225.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0dd4521b-3e41-4083-9bcc-807cce03ae78.filesusr.com/ugd/cfe2e9_cfa72816afc0481ea48e9e6622d668b0.pdf?index=trueIn PDF document text
    • https://9e2901ea-5d25-41a5-867c-54d0774c6e48.filesusr.com/ugd/4d0f37_3b5011a0695442c993b514ba9a53baeb.pdf?index=trueIn PDF document text
    • https://367e539a-c541-4439-991c-4bf2bef2aa7a.filesusr.com/ugd/77d535_8751d80a857642bd96b5e0f8b25b9843.pdf?index=trueIn PDF document text
    • https://22fea36a-5e19-4af1-b4aa-fe6e1efe0ee9.filesusr.com/ugd/b5a188_72493c2aa9e14b9aab2a80218d994cdd.pdf?index=trueIn PDF document text
    • https://2a983b51-2e13-4971-8c1f-a5bca3ab4353.filesusr.com/ugd/e1a791_4e244351adb144398abd7c547f75278d.pdf?index=trueIn PDF document text
    • http://rukosivujuxu.atwebpages.com/17220588797.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_off000102ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102EC 5240 bytes
SHA-256: cfde2c90272ae2eb7159f628bf7a853b5d9b81761c01bdeb5ca0bdcb0102d206
font_01_sfnt_off000114af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114AF 11224 bytes
SHA-256: b71d12441b96d0f61c3db469c50136953821e7994eb831bf0635822404ed1ccd