Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd7ced1e561816be…

MALICIOUS

PDF

83.7 KB Created: 2021-09-14 02:47:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5b3ee784f7b3dab13e3141962118694a SHA-1: 95b32e09969f588a28683beabf3eb7ec5b466bbe SHA-256: fd7ced1e561816be3b606d76dec049c80d83dc955130961056fe021f50f0b1a1
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous distinct URLs pointing to disposable hosting, suggesting an attempt to distribute malicious content or phish for credentials. The presence of many unknown reputation URLs reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://p-itos.net/admin/userfile/image/file/vupadazazisulapijis.pdf In PDF document text
    • http://sportsclinicwest.ie/media/contents/file/bekofufavototodun.pdfIn PDF document text
    • https://gym-rectif.fr/ckfinder/userfiles/files/87354295605.pdfIn PDF document text
    • http://hak-al.com/resimler/files/pavulerovodumugifibezom.pdfIn PDF document text
    • http://pro-roubenky.cz/UserFiles/File/86343828774.pdfIn PDF document text
    • http://cdkuysuujk.handysociality.com/upload/files/begezemunafakudobove.pdfIn PDF document text
    • http://jucal.es/images/file/39154816896.pdfIn PDF document text
    • http://iscelenie.info/files/file/16509508683.pdfIn PDF document text
    • http://crmloccitanecr.com/campannas/file/nejexusalav.pdfIn PDF document text
    • https://www.agcontraincendios.es/ckfinder/userfiles/files/derid.pdfIn PDF document text
    • https://naveenent.com/administrator/imagetemp/file/74942088418.pdfIn PDF document text
    • http://jiachuankeji.com/upload_fck/file/2021-9-12/20210912012925993796.pdfIn PDF document text
    • https://laptopserwis.com/app/webroot/media/files/50103974197.pdfIn PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210905_C9F4FA4C127F6A65.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/didegidusatobeduludafaf.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1613fdac709e34---fuxajeso.pdfIn PDF document text
    • http://forti.in/userfiles/file/521134717.pdfIn PDF document text
    • http://ipublicity.cz/data/file/jifozewarobowunobokizok.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/pabovaxozozekasoruw.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138f20a39573---vemimim.pdfIn PDF document text
    • https://ikima.fr/uploads/file/jefarivu.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/mezorukufugodafibotokuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=rotate+screen+180+degrees+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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDB 10924 bytes
SHA-256: 05267ae1493a7de57bc1b5a952b0eb640c1f26f529873181629e521e70bed26b
font_01_sfnt_off0000f626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF626 19676 bytes
SHA-256: 0e515c3601c4314ecb7e2243dd73bd9bf6f3b892a6fee80573c5e7a80ceab0b7
font_02_sfnt_off0001296f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1296F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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