Malicious PDF — malware analysis report

Static analysis result for SHA-256 db9a88f82505a2a7…

MALICIOUS

PDF

79.7 KB Created: 2021-09-20 21:47:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 2ff60591618b0ec91eb754f4c7fbe7ff SHA-1: 6c86ae3cde5f069db770e2c049b57f60619a449a SHA-256: db9a88f82505a2a7541a8b1c62ccd1d6ceaffe2bc4cc2d4dc781fd5b9c62b0e5
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF sample was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and multiple external links, some of which are algorithmically generated and hosted on disposable domains, suggesting a phishing or malware distribution scheme. The presence of embedded JS points to an attempt to execute code within the user's PDF viewer, likely to download and run a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://mistral-paints.cz/userfiles/files/62150777873.pdf In PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/kesaguralosadigesoratinu.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/silufufotepijoliziw.pdfIn PDF document text
    • http://www.vnv.nu/admin/library/ckfinder/userfiles/files/54645327114.pdfIn PDF document text
    • http://munnartourism.com/uploads/file/vesesujofakeratirunifag.pdfIn PDF document text
    • http://votava2.altrodesign.eu/ckfinder/userfiles/files/ratajakoveroloxulanu.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/14e4f64685a537bd66c8bff9eb52300e/58647683773.pdfIn PDF document text
    • https://stradatextiles.com/upload/ckfinder/files/38810587311.pdfIn PDF document text
    • http://euromarkcreations.com/new/fck_img/file/xulas.pdfIn PDF document text
    • http://paraglider24.de/pics/fotos/1/file/37538133038.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/2a0bfil73jk5q9fsss9ptde392/pejuviwatufosomi.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/bananuwofuxidu.pdfIn PDF document text
    • https://ferropula.hr/files/sosolax.pdfIn PDF document text
    • http://www.ishvani.com/www/js/ckfinder/userfiles/files/xolerotinuxe.pdfIn PDF document text
    • http://renknh.com/ckupload/files/kalawewexaru.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/9580526350.pdfIn PDF document text
    • http://thevalleytrader.com/files/joribajipuguv.pdfIn PDF document text
    • https://peusch.lu/userfiles/files/dirali.pdfIn PDF document text
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/faral.pdfIn PDF document text
    • https://beaszemin.com/files/18763063191.pdfIn PDF document text
    • http://stlukesfp.org/ckfinder/userfiles/files/rirefu.pdfIn PDF document text
    • http://scsychem.com/upload/files/bagesagofuwuvika.pdfIn PDF document text
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/numabijivixabir.pdfIn PDF document text
    • http://pscemetery.com/userfiles/file/zivufevogovodokaxibobewe.pdfIn PDF document text
    • https://bodymason.com/user_uploads/files/588485458.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/615893399.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=hex+installer+android+10PDF 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_off0000d165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD165 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e97c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97C 10508 bytes
SHA-256: 024a83fcaa34f01d8b5258887c57d788e6062a7e5345c69c270e8230d1a831ca
font_02_sfnt_off00010183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10183 18352 bytes
SHA-256: 833b098e731ed482d4895770923fe6133d87e72807286b03f179c90fedf8d215

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