Malicious PDF — malware analysis report

Static analysis result for SHA-256 29f405b3cb4aa261…

MALICIOUS

PDF

80.3 KB Created: 2021-09-26 11:03:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1c64bfaa71c788204afc9524144b41e7 SHA-1: eb8a4c7cb5fc6547f2cf8c121ba7c274d1f97c99 SHA-256: 29f405b3cb4aa2610470d94951227860bc68908c46752a7620138d982015bb70
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external links, many pointing to disposable domains, characteristic of a link farm used for phishing or malware distribution. The heuristic 'SE_LOLBIN_RUN_COMMAND' suggests the document text contains sequences that could be interpreted as commands, potentially for executing malicious code or directing users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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
  • 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 http://technoprofile.ru/userfiles/file/rifozax.pdf In PDF document text
    • https://www.mnogotrop.com/ckfinder/userfiles/files/tawabonukezomuzet.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/8444324818.pdfIn PDF document text
    • https://slide-bearing.com/d/files/worifesonexifoto.pdfIn PDF document text
    • http://sweepinstyle.com/userfiles/file/8302390062.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/figake.pdfIn PDF document text
    • http://calisnt.com/uploads/files/76559882405.pdfIn PDF document text
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/wemogipozalepudul.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/18171458211.pdfIn PDF document text
    • https://bisleriwheel.genefied.co/ckfinder/userfiles/files/donalotawuv.pdfIn PDF document text
    • https://fleseriuassociates.ro/files/file/nepexel.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c081eca884---63305937631.pdfIn PDF document text
    • http://annabarons.lv/files/files/125606378.pdfIn PDF document text
    • http://nasfthr.com/userfiles/file/jaboxulowifevabugo.pdfIn PDF document text
    • https://slezanie.eu/userfiles/file/fopixobiwonazu.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/tiner.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/pogejibunisutezoki.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/rujawasejo.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/wajur.pdfIn PDF document text
    • https://thegioibaobicarton.com/Images_upload/files/tinatuzi.pdfIn PDF document text
    • http://sun-dr.com/uploads/files/202109051553389313.pdfIn macro / runtime command snippet
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/taweposa.pdfIn macro / runtime command snippet
    • http://yongchengtech.com/uploads/files/202109030736033899.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1614b706ba2d4c---zirez.pdfIn PDF document text
    • http://kronospan-mofa-hungary.hu/editor_up/gineremudumutenudusiwowu.pdfIn PDF document text
    • https://thegioibaobicarton.coIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=mtk+easy+root+latest+versionPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b8a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8A0 20636 bytes
SHA-256: d6c053460cdd4206360dcaa16e86b46e2a40a6ef8d8c300e6e6d209f5dac603f
font_01_sfnt_off0000ed0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED0B 16236 bytes
SHA-256: c70994fd1470e94a558214f61911663d50d8fef3d25c3e0a4c1e0368497764bf
font_02_sfnt_off000102fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00011b14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B14 10364 bytes
SHA-256: a0e4698d411602078fefde4dd0b09538005dfbbec098b9a5bf8f34d9d1e71f8c

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