Malicious PDF — malware analysis report

Static analysis result for SHA-256 d075e3109033104d…

MALICIOUS

PDF

86.4 KB Created: 2021-03-23 16:50:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 5158bc8b3b97325b62616eae5f85d20f SHA-1: c65604f847c7ee5ee7339c87eaa43aa290d52cb2 SHA-256: d075e3109033104d0a029c24071cbb70138491399c9b41f6c46af017d0f0476b
166 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and a heuristic firing indicates it's a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The document body, though heavily obfuscated, contains text fragments that, combined with the heuristics, indicate a lure to external websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://jumiwimov.ru/wix?keyword=realidades+1+capitulo+2a+answers+page+31 PDF link annotation
    • http://habercigo.com/1363520641995lcs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392195/normal_600a06bcf3060.pdfIn PDF document text
    • https://cdn.sqhk.co/temazajilib/cgcjiib/happy_guts_racing_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453134/normal_6024462640b96.pdfIn PDF document text
    • http://mumijivamivaxij.medianewsonline.com/how_to_remove_windows_powershell_virus.pdfIn PDF document text
    • http://hamlikjorettoop.ru/suzuki_digital_baby_grand_piano_costco0tqz8.pdfIn PDF document text
    • http://jalakerag.22web.org/pofokoleziju.pdfIn macro / runtime command snippet
    • http://magic-spring.com/fender_super_champ_x2_manualdfock.pdfIn macro / runtime command snippet
    • https://cdn.sqhk.co/delojiwuguj/5ghggeJ/unikitty_save_the_kingdom_apk.pdfIn PDF document text
    • http://zoneeuro.pro/labepirm3g3d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385633/normal_5fe5926cd1522.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426828/normal_5fd6cf25671f3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421959/normal_5fdf490ccc1e3.pdfIn PDF document text
    • http://sowinod.mywebcommunity.org/dowifibugoratabanig.pdfIn PDF document text
    • http://b0xberry.online/kawosojaxigogobasuxr73h.pdfIn PDF document text
    • http://hamlikjorettoop.ru/suzuki_digitaIn macro / runtime command snippet
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://zapavuvezozetet.epizy.com/batefoxupevirekasawa.pdfIn PDF document text
    • https://s3.amazonaws.com/fejenijovekozu/govibodiwori.pdfIn PDF document text
    • http://mibelajute.epizy.com/fundraising_chart_thermometer_template_word.pdfIn PDF document text
    • https://s3.amazonaws.com/senodiw/20691083844.pdfIn PDF document text
    • http://dakokaxawizepu.epizy.com/60060938260.pdfIn PDF document text
    • http://furipurisebete.onlinewebshop.net/jidosaxigedubamimelivavu.pdfIn PDF document text
    • http://tagijonegularol.myartsonline.com/62540735785.pdfIn PDF document text
    • http://mujelinenifa.rf.gd/extra_practice_chapter_7_geometry_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/rubidokezive/jopugisojumexujozum.pdfIn PDF document text
    • https://s3.amazonaws.com/vudivuzakal/graphic_designers_resume_templates.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10046 5568 bytes
SHA-256: 107cdd1676ee015a2fbcfecfd41a883b862090b504214ea31ec97fd7a070f3b5
font_01_sfnt_off0001135b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1135B 13368 bytes
SHA-256: 0f3b9613775e2534af6c543fcfa923519bbf256918605b66b816098b14ca483b
font_02_sfnt_off00013d81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D81 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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