Malicious PDF — malware analysis report

Static analysis result for SHA-256 62fd9a386d586882…

MALICIOUS

PDF

75.7 KB Created: 2021-09-16 08:25:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bb14fbbe04b2e9375f0dfb20fa65c160 SHA-1: 654d6b11dce9905987003c894f724520e668d012 SHA-256: 62fd9a386d58688275aee854fe84e1d6efc4038df58c52f5032ba247050aa8a0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to potentially malicious or phishing sites, and the PDF structure suggests it's acting as a link farm. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports its role in directing users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://philabc.ru/uplcv?utm_term=configuration+changes+android PDF link annotation
    • https://aydin-elektrik.com/resimler/files/tiwufudut.pdfIn PDF document text
    • http://atel-j.nl/uploads/files/nokububigini.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/dijowosobefomose.pdfIn PDF document text
    • http://ellenia3.eu/userfiles/files/16014140148.pdfIn PDF document text
    • http://halmar.info/userfiles/file/55049411087.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/gobirafokupi.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/dakubifimezudedizabe.pdfIn PDF document text
    • http://brickchamber.com/ckfinder/userfiles/files/warigar.pdfIn PDF document text
    • http://uceng.net/_UploadFile/Images/file/bopesibajal.pdfIn PDF document text
    • http://konstruktor33.ru/app/webroot/files/files/17593544596.pdfIn PDF document text
    • http://vers-ma.de/userfiles/file/vibesatetagelixanufoxok.pdfIn PDF document text
    • http://jualumnitoronto.com/editor/uploadfiles/xabutetokebivexokatujopo.pdfIn PDF document text
    • https://www.chablis-gautherin.com/ckfinder/userfiles/files/medejo.pdfIn PDF document text
    • http://emannsltd.com/userfiles/7211191461.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/21890355823.pdfIn PDF document text
    • http://tageedesign.com/ssmpt/documents/file/nuwinobadaripixetulez.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16138b7661a01f---jidevukivegiso.pdfIn PDF document text
    • https://opescom-store.com/uploads/FCK_files/file/7663588252.pdfIn PDF document text
    • https://monamifrance.com/FileData/ckfinder/files/20210914_7ED67218B25B65E6.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/liwogedoledizamaxagomuti.pdfIn PDF document text
    • http://ndc-group.ru/uploads/files/bixebepinijabaridajovatak.pdfIn PDF document text
    • http://ls12368.com/userfiles/file/bugunilasusiz.pdfIn PDF document text
    • http://nut-shell.net/upload/files/35887180798.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/c76t0uu6dd6lnf4h8mgc6jfoaj/dekobuwesemapemosiwe.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://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_off0000c2a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2A3 10840 bytes
SHA-256: bee02c50ec8cf2debc554554839944ca6264018165a336ebb8b939612315719d
font_01_sfnt_off0000db78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB78 17340 bytes
SHA-256: cd98b24f27883c383b915f6c2954af600bad91e8255afe07d9534dbb8bb9668c
font_02_sfnt_off00010914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10914 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1