Malicious PDF — malware analysis report

Static analysis result for SHA-256 f957eb7ccf32b421…

MALICIOUS

PDF

86.7 KB Created: 2021-09-20 01:08:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ecde9f3b0fad907cf04ade26184160d2 SHA-1: 805fbe3f536efdf6e6d59b2a2bfbbe25eed71521 SHA-256: f957eb7ccf32b421060012e168476d4210d9f986367615681b0ee067e4bb0a7e
194 Risk Score

Malware Insights

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

This PDF document exhibits multiple indicators of malicious intent, including a high ML classification score and ClamAV detection as a phishing trojan. The presence of a 'download button' lure and instructions for a password-protected archive suggest a social engineering tactic to trick users into downloading a payload. The document also contains numerous embedded URLs, many of which point to unknown or potentially malicious domains, indicating a link farm or distribution network.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://asorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/59046365083.pdf In PDF document text
    • http://erbaytag.com/resimler/files/pemutuvivirus.pdfIn PDF document text
    • http://ph-easycome.com/userfiles/file/jexudiwe.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/venijitexutuloruze.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/burejewenagenad.pdfIn PDF document text
    • http://hasyo.net/files/file/siwumoba.pdfIn PDF document text
    • http://faizleathergloves.com/userfiles/files/1745653650.pdfIn PDF document text
    • http://hotelrefah4ter.ir/basefile/hotelrefah4terir/files/83691682999.pdfIn PDF document text
    • http://intemhathanh.com/img_duhoc/files/70882497640.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/71337532923.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef3792e5fd---24986273351.pdfIn PDF document text
    • http://faizleathergloves.com/userfiles/files/duxobupadejaje.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/xirobogidit.pdfIn PDF document text
    • https://lmbri.com/WYSIWYGImage/file/13613225556.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/92126963012.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/34386670051.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/povarawefon.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/28350549764.pdfIn PDF document text
    • https://woodfur.in/userfiles/file/lumopazobulafirakilakafej.pdfIn PDF document text
    • https://bodykneadstherapy.com.au/ckfinder/userfiles/files/28393131003.pdfIn PDF document text
    • https://rtvpuls.com/ckfinder/userfiles/files/72852544382.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/90681529747.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=gta+san+andreas+download+apk+200mbPDF 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_off0000ef71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF71 16912 bytes
SHA-256: fc2eecedb3f29499decbc5c731e1976168fd3cb62dfc2bdb8822e53c6aacd047
font_01_sfnt_off00011b71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B71 11060 bytes
SHA-256: 34aef028abf2ea7ac37ee73d5fe87272c3fb2ab99ffc7a905f4c3bb70db170d2
font_02_sfnt_off0001351b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1351B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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