Malicious PDF — malware analysis report

Static analysis result for SHA-256 efb746dba6530f34…

MALICIOUS

PDF

75.8 KB Created: 2021-04-02 03:22:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: d807068cdb4e4805cd8e4559e16512f1 SHA-1: 707c2424b40353454bbe321eee54bc8175641a66 SHA-256: efb746dba6530f34e086bf1b4e317ab8b9a88162ca5815803ac2eab5939c0617
134 Risk Score
Tags
free-cdn-ebook-manual-lure

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. It uses an invoice-themed lure. 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 0.9993

Heuristics 6

  • 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 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://mezovuduw.ru/123?utm_term=notice+to+vacate+template+nj PDF link annotation
    • http://hackins.site/156160304880dlrq.pdfIn PDF document text
    • https://wavikifetin.weebly.com/uploads/1/3/4/9/134901048/gudonuruzepe.pdfIn PDF document text
    • http://weex.info/batman_1_full_movie_in_tamilhhwzz.pdfIn PDF document text
    • https://tevejokufip.weebly.com/uploads/1/3/0/9/130969131/zopukoju-vubudejezajula-xovizaterox.pdfIn PDF document text
    • http://indonesia2health.online/how_does_the_phosphorus_cycle_affect_humanswnumd.pdfIn PDF document text
    • https://ludekomu.weebly.com/uploads/1/3/4/5/134505051/warafemalawajegosino.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459468/normal_603d8a1635fdb.pdfIn PDF document text
    • https://nugukofijopi.weebly.com/uploads/1/3/2/7/132712180/joguma.pdfIn PDF document text
    • http://chunyoo.com/astrology_in_ancient_mesopotamiauzmq1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469863/normal_5ffb592db3b23.pdfIn PDF document text
    • https://kogafisefog.weebly.com/uploads/1/3/1/4/131438876/f47e22b8ca27b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461498/normal_601f71162e50a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495251/normal_603128446c312.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dokelegusipodi.epizy.com/car_game_3d_apk_2019.pdfIn PDF document text
    • http://betiger.epizy.com/walden_or_life_in_the_woods_conclusion_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/zalomi/agenda_template_without_times.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ca3f544-b884-4fcf-94fb-b26b01aef1bb/biranofojokuzabojalud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/250474f2-36a7-4283-a3e8-c5088da4f889/cfa_syllabus_level_3.pdfIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/samsung_rfg298hdrs_ice_maker_assembly.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a517a2b9-bf88-401b-b811-038283d73d00/nulemenojapejijevolegaz.pdfIn PDF document text
    • http://xikepidefam.epizy.com/82823548158.pdfIn PDF document text
    • https://s3.amazonaws.com/nuvukivaxiren/nozar.pdfIn PDF document text
    • http://boxulinizisa.epizy.com/medical_certificate_format_for_students_in_word.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_off0000ed8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8F 4908 bytes
SHA-256: f490cf81ef720b8ddeb2e7da4249c682a5efc5fde0c1d6cb6f86ca191e2295a3
font_01_sfnt_off0000fe46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE46 10544 bytes
SHA-256: b3c715ad0a49643148f4c2dab89922e4a97b373b7002dcf56f6dd8e47c116011

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