Malicious PDF — malware analysis report

Static analysis result for SHA-256 1eacf6a998046a60…

MALICIOUS

PDF

81.1 KB Created: 2021-09-16 15:45:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3575f16530fc96664cf90c1b0c431460 SHA-1: e498a32103c266abcacf2836e8334a5c0198bbed SHA-256: 1eacf6a998046a60d0b4028a53e0c1c5e6df2f5b4799ff5a57ca901f48169452
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to a link farm hosted on disposable domains, a common tactic for phishing or malware distribution. The document body is heavily obfuscated, but the presence of external URIs and the link farm heuristic strongly suggest a malicious intent to redirect users to harmful sites.

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://synerhu.ru/uplcv?utm_term=how+to+use+my+phone+as+a+hot+spot PDF link annotation
    • http://dasbluemchen.com/5493954206.pdfIn PDF document text
    • http://graficaeformazione.it/userfiles/file/10198214085.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613264cb811be---72487380988.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/sawodinesemorudafotiw.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/73792247389.pdfIn PDF document text
    • https://bloomlight.pl/_bloom/file/sewafuzotilawoxip.pdfIn PDF document text
    • http://jiab.net/userData/board/file/77941820961.pdfIn PDF document text
    • https://watosaphotography.com/app/webroot/userfiles/files/20210908_025242.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/45225827083.pdfIn PDF document text
    • http://aviafond.ru/userfiles/file/demigi.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.net/filespath/files/20210913225008.pdfIn PDF document text
    • http://roocenter.ru/upload/file/kudemozetuliso.pdfIn PDF document text
    • https://buyafranchise.org/files/files/76328153087.pdfIn PDF document text
    • http://www.bash.cl/media/file/jinorapepotopodalifajal.pdfIn PDF document text
    • http://vetsnab32.ru/userfiles/file/36798618446.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/momado.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/b7ff243ae6e24db2819d94abd60da3b7/lagewutirobifevulexuw.pdfIn PDF document text
    • https://tradegateindia.com/userfiles/file/wulapinonokegizaliwemunid.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/jizafoleradelenoleto.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/vofijurip.pdfIn PDF document text
    • https://namphuctourist.com/userfiles/file/72292133599.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/67272941281.pdfIn PDF document text
    • https://baobiachau.com/luutru/files/48069220342.pdfIn PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/nigija.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/wizofopabefazegijones.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_off0000d77e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD77E 17908 bytes
SHA-256: 0dd58e6c0d07b3fa6f4fcf43d65f27dc314033b6b1398ea550e1df357e48cfb0
font_01_sfnt_off00010649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10649 10568 bytes
SHA-256: aeeb14e9992559f00829fca60936c6410b00ffebd7023a33e35aec3ea22d056c
font_02_sfnt_off00011e52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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