Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e1f6cee030a1abf…

MALICIOUS

PDF

79.0 KB Created: 2021-10-03 23:10:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 9c1cbf633b91bc44b7591a1bdb399f80 SHA-1: 8afef734af051d728a77a5789de1bf96961c4cbb SHA-256: 2e1f6cee030a1abf3a523dbff24775d6f5b4267d2d2b6fc9c5f221c7c155cfae
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains and acting as a link farm, a common tactic for phishing or distributing further malware. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a deliberate attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://queure.ru/uplcv?utm_term=low+abundance+meaning PDF link annotation
    • https://girisimhaber.com/uploads/file/pikaxuvofuguki.pdfIn PDF document text
    • http://eternaseguros.net/files/files/leximafa.pdfIn PDF document text
    • http://volamthienha.top/userfiles/file/xizasiralugewoguwinalegu.pdfIn PDF document text
    • https://alcc.c-zentrix.com/ALCC/mail_attachments/multitenant-ws-01/1/1630714400.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/bm2rocihle67aunogjinguifm1/lowizabo.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/68337870220.pdfIn PDF document text
    • http://metalzilemboeventi.com/userfiles/files/96143632628.pdfIn PDF document text
    • http://sibmaxi.ru/userfiles/file/bozadakizumek.pdfIn PDF document text
    • https://preciseenergygroup.com/media/19719932812.pdfIn PDF document text
    • http://resurrection-life.net/userfiles/files/78463271468.pdfIn PDF document text
    • http://pacemakerpressintl.com/uploads/assets/file/texodofidavi.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/77834958554.pdfIn PDF document text
    • https://xn----8sbcehyodmtf1czh.xn--p1ai/userfiles/file/220632928.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/sodusepasofepuromagogi.pdfIn PDF document text
    • http://mamitobe.ru/files/file/xadisijewamado.pdfIn PDF document text
    • https://ceylanotel.com/firma/files/72921646475.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/47104997752.pdfIn PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/wejuposulirakafeso.pdfIn PDF document text
    • http://excitechem.com/userfiles/file/tidowulepufuzed.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/ginarabexigowodojafu.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/welifokuvozar.pdfIn PDF document text
    • http://koutingchina.com/upload/files/nerojimutufomifomezejifu.pdfIn PDF document text
    • http://9y.bfage.com/upload/files/20210923112341.pdfIn PDF document text
    • https://yakin-surewin.com/media/file/88054478663.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_off0000c6cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dedf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDF 21592 bytes
SHA-256: 1f2579cf33c709a9148cad860e23b88970c5b5691fef55d0a44f3f8779bb314d
font_02_sfnt_off0001169b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1169B 10584 bytes
SHA-256: 9112bf0bfa79db0e873c043dd2f0cfb03c88f8ce44c2c02175ccc6c8c85a3bb7

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