Malicious PDF — malware analysis report

Static analysis result for SHA-256 40326e886838ff35…

MALICIOUS

PDF

79.1 KB Created: 2021-04-27 10:00:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 35044269b96bb5b832922f686e603112 SHA-1: 33f5cfa6da70c948daf32e7bf779a52df7071a6d SHA-256: 40326e886838ff356d0b0b652913505d255d5d8654c35d78ec196cbf354f5c68
166 Risk Score

Malware Insights

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

The PDF document is classified as malicious by ML models and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting, and the document body, though truncated and obfuscated, suggests a lure related to 'communication skills' to disguise the malicious links. The presence of external URIs and link farm heuristics strongly suggests the document is designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://nipisod.ru/strik?utm_term=how+to+have+great+communication+skills PDF link annotation
    • http://sugebowupubixo.mypressonline.com/xogedexugeperawitipojujuv.pdfIn PDF document text
    • http://linunewilut.mywebcommunity.org/wukadi.pdfIn PDF document text
    • https://cdn.sqhk.co/sirepajaku/haVCMiL/dog_fighting_quarterback.pdfIn PDF document text
    • http://ek-arenda.ru/rurudadatov95u1g.pdfIn PDF document text
    • https://zasuzepomuban.weebly.com/uploads/1/3/4/6/134627511/berize.pdfIn PDF document text
    • http://edarudost.online/jidinidwzwag.pdfIn PDF document text
    • http://lalexejiwisejul.iblogger.org/stoner_john_williams_english.pdfIn PDF document text
    • http://tonaginu.iblogger.org/how_to_make_naturally_curly_hair_straight_for_guys.pdfIn PDF document text
    • http://plafond.xyz/rome_2_augustus_campaign_guideh9rxd.pdfIn PDF document text
    • https://gijajagilaz.weebly.com/uploads/1/3/5/3/135313732/5931440.pdfIn macro / runtime command snippet
    • http://soldonlakewood.com/jopuzorikilelixobifoku8f7x2.pdfIn PDF document text
    • https://vuxaxumiduwo.weebly.com/uploads/1/3/4/6/134603627/239077d43d.pdfIn PDF document text
    • https://cdn.sqhk.co/tumosirewuw/ejaf1gg/rezizex.pdfIn PDF document text
    • http://plafond.xyz/rome_2_aIn macro / runtime command snippet
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fuvarijes.atwebpages.com/913889124.pdfIn PDF document text
    • http://xedaxabefax.rf.gd/factores_y_riesgos_psicosociales.pdfIn PDF document text
    • http://rojanesifilagu.myartsonline.com/adj_adv.pdfIn PDF document text
    • http://ladofinaziza.epizy.com/how_do_you_turn_on_jyou_smart_bracelet.pdfIn PDF document text
    • https://s3.amazonaws.com/pewebopufupe/88979854920.pdfIn PDF document text
    • https://s3.amazonaws.com/fujadabez/xediposubazutixudam.pdfIn macro / runtime command snippet
    • https://s3.amazonaws.com/woxorojero/vufagip.pdfIn PDF document text
    • http://voxotili.epizy.com/sirawelukepijuloxotitapom.pdfIn PDF document text
    • https://s3.amazonaws.com/nalifij/gate_2018_instrumentation_books_free.pdfIn PDF document text
    • https://s3.amazonaws.com/nitajosasa/animated_love_video_songs_free.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_off0000f881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF881 5388 bytes
SHA-256: 57cd8e246abfb2225607c809ad32005351ea3dfb4c9a8a11a0c547c10cdb74c0
font_01_sfnt_off00010ac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC3 10584 bytes
SHA-256: d852ec80735e3ea59b279981c38f2d047181b8db2ca89d16735b9135ca1cd8e7