Malicious PDF — malware analysis report

Static analysis result for SHA-256 383d04c33d0b1ca6…

MALICIOUS

PDF

88.3 KB Created: 2021-09-18 04:24:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b65e833ba7bb82482a3570399870d1c8 SHA-1: 2b577f02ce56ddeb4e1239151de97e478b73de1d SHA-256: 383d04c33d0b1ca6debfcf431b6ce499872999b68665f4f76e75c8d119c40448
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to other PDFs hosted on disposable domains, indicating a link farm designed to distribute malware. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and heuristic firings point towards a malicious document designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://anticacarsulaeborzoi.eu/userfiles/files/82211018851.pdf In PDF document text
    • http://storemisr.com/uploads/files/tafaz.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/xufumagipotirujipexumu.pdfIn PDF document text
    • http://cmtsport.com/pliki/dodusegabiji.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/8867306903.pdfIn PDF document text
    • https://kawanmto.info/contents/files/fesogezawusopo.pdfIn PDF document text
    • https://flcevent.fcu.edu.tw/plugin/ce1/ckfinder/userfiles/files/20210902054954.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/63679770430.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/womugiwaviwexedisumu.pdfIn PDF document text
    • http://holzbau-napetschnig.at/93844680627.pdfIn PDF document text
    • http://roocenter.ru/upload/file/gukokidutaribokuboruwaji.pdfIn PDF document text
    • http://carraracucinecomponibilitrapani.it/userfiles/files/barisifovopelelatewetave.pdfIn PDF document text
    • http://tbff-bygg.se/img/files/pitabepuvogozuwut.pdfIn PDF document text
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/59153344203.pdfIn PDF document text
    • http://euro520.net/userfiles/file/16310242651976131256.pdfIn PDF document text
    • http://saint-party.com/media/file/60383842727.pdfIn PDF document text
    • http://crm333.com/documentos/file/lijinalebotijuwoz.pdfIn PDF document text
    • http://chernogolovka.inhome360.ru/admin/ckfinder/userfiles/files/53533374352.pdfIn PDF document text
    • https://muzpony.de/obrazki/file/14977538667.pdfIn PDF document text
    • https://sergiomauri.com/images/file/disozegedabofedajafod.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612eeb0716959---45405741567.pdfIn PDF document text
    • http://spad.kr/userData/ebizro_board/file/sajefope.pdfIn PDF document text
    • http://bimbrlata.cz/UserFiles/File/76097543140.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/56216020335.pdfIn PDF document text
    • http://www.puhito.hu/uploads/memakeduropudamozimugel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=dragon+ball+z+episode+219PDF 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_off0000d9e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E0 23732 bytes
SHA-256: fbc5b53c1a404f0d2a24a82055af923d0d2a4b8439652115554f6d7e842ba461
font_01_sfnt_off000116e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E8 2468 bytes
SHA-256: ad5b29355b6205c962166507989814a0af28795101210b7906b43556af07a4e6
font_02_sfnt_off000121bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121BD 11008 bytes
SHA-256: 7995d8149749cdd1567c11d67f070a7bb6a6b2831ef0d515e9ef1387f077f3e1
font_03_sfnt_off00013b0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1