Malicious PDF — malware analysis report

Static analysis result for SHA-256 e61a7000470acc9a…

MALICIOUS

PDF

83.6 KB Created: 2021-09-13 00:24:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: b476f274cd05ba56e2327ced944a2ac1 SHA-1: 4cfceb9687a80ba6b78a3ca453057bfa59025125 SHA-256: e61a7000470acc9a1bc0b0dace4221e844644cec5b157316855f435b90a49c99
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://fli.edu.mn/ckfinder/userfiles/files/40791256660.pdf In PDF document text
    • https://sitycare.com/FCK-UserFiles/files/25025809100.pdfIn PDF document text
    • http://vin-baietii.ro/ckfinder/userfiles/files/19221867602.pdfIn PDF document text
    • https://stichtingech.org/ckfinder/userfiles/files/zamulunulovomefije.pdfIn PDF document text
    • https://sunridgecorp.com/uploads/files/202109031029526062.pdfIn PDF document text
    • http://abwingsde.com/uploads/files/jimabovapuvaganedo.pdfIn PDF document text
    • http://analhospital.net/file/files/resakorupavatofuvasepo.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161338fe4556da---75135691313.pdfIn PDF document text
    • http://utcsp.rustyramone.com/uploads/files/59353288575.pdfIn PDF document text
    • http://xszhuhai.com/uploadfiles/files/netotuvepinumetowupe.pdfIn PDF document text
    • http://hooleihomes.com/cms_images/file/65614174821.pdfIn PDF document text
    • http://energywork.pl/userfiles/file/bubawogojiroma.pdfIn PDF document text
    • https://equalitas.es/userfiles/file/jugoxoxavekaramagutiga.pdfIn PDF document text
    • http://wirheiraten.de/images/file/33673025849.pdfIn PDF document text
    • http://topliving.sk/userfiles/file/66170057034.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/18762268104.pdfIn PDF document text
    • https://ldoris.com/upfile/files/20210908010831.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/tukinutinixoporawepezuwaw.pdfIn PDF document text
    • http://jucal.es/images/file/lolumowowarena.pdfIn PDF document text
    • http://usmleworkout.com/files/file/88913985516.pdfIn PDF document text
    • http://sushiosushi.com/uploads/files/34601219034.pdfIn PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/jujotenupibaloderobes.pdfIn PDF document text
    • http://czechnews.cz/userfiles/files/14794541461.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/919a8dfa57cd22dfed4801b24acdd35a/fotarodemobetu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+find+the+file+manager+on+androidPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF13 18676 bytes
SHA-256: 3067a01e8532629e55360b946beadc65d0800e63397ad78cf0618fcba2eb3a68
font_01_sfnt_off00011014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11014 10708 bytes
SHA-256: 405b7ce372936a6a37c503c74d4a1672e9de5abce287f87a5b08726a79bf73cf
font_02_sfnt_off00012831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12831 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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