Malicious PDF — malware analysis report

Static analysis result for SHA-256 d159bb802c89006e…

MALICIOUS

PDF

70.3 KB Created: 2021-09-25 16:46:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bc878d98e411d0bbac76665840471202 SHA-1: d762856b9235d729d1bdebb7317a8b48917d78bc SHA-256: d159bb802c89006ecf54cbaa4301a3550172426fb31730e523077065d0fbef31
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. The heuristic analysis identified it as a link farm, directing users to numerous other PDF files hosted on various domains. While no scripts were directly extracted, the nature of the links suggests a campaign to distribute further malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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.
  • 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://dichvumoinoi.com/ckfinder/userfiles/files/suvalarewalibizaliwowudo.pdf In PDF document text
    • http://kirilmazbardak.com/userfiles/file/wisorotubokawusulonemosok.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/wujivogemexa.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/nimugulujulonuzaw.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/jegadafoponuxogurilufoga.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613335d74c61a---78248382682.pdfIn PDF document text
    • https://euronet.stonavka.cz/webpagebuilder/ckfinder/userfiles/files/44267917699.pdfIn PDF document text
    • https://bunianco.com/other_files/File/vebopisuvamaxo.pdfIn PDF document text
    • https://kmkmekanik.com/upload/ckfinder/files/gobubibopelelirivibade.pdfIn PDF document text
    • http://aviatechinform.ru/sadm_files/nerikajiximobob.pdfIn PDF document text
    • http://rebeccaosborne.com/uploads/nofojefebuw.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/sesoputoke.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/73486818466.pdfIn PDF document text
    • http://dalaichau.com/files/97682194932.pdfIn PDF document text
    • https://dhesient.com/media/niwodolaruleb.pdfIn PDF document text
    • https://raselapp.com/userfiles/file/kemubatadojukozazobozunex.pdfIn PDF document text
    • https://nieruchomosciprzetargi.pl/files/file/5761097451.pdfIn PDF document text
    • http://a2hgghk.handylover.com/upload/files/34030667888.pdfIn PDF document text
    • http://www.smpnuenen.nl/images/files/wexewilewapiridu.pdfIn PDF document text
    • http://oldmotorsclub.com/files/file/jimidodosen.pdfIn PDF document text
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/godaxoriwufowizumaruzitef.pdfIn PDF document text
    • http://polishedskincare.com/minaret/uploads/file/75829723701.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/sazazesed.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/48922431196.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-21/20210921050855907985.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=among+us+free+play+without+downloadPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b3ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3CE 11224 bytes
SHA-256: f5a20558f66b6a71ccce7e432c33e2db07eb6a459736a0b198c0fda7157b45ab
font_01_sfnt_off0000cdcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDCB 14640 bytes
SHA-256: eb5a09f457cecd872c4c312942ec53d495b64c9f53b55f5254c3aa09fb43a389
font_02_sfnt_off0000f2c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1