Malicious PDF — malware analysis report

Static analysis result for SHA-256 261c6cd925066a05…

MALICIOUS

PDF

80.4 KB Created: 2021-09-11 10:07:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: 8e5cbf6f64fba13f8b6b17585de6edc9 SHA-1: 0125226440c21d8dc3d72c30c84919cf7db561e9 SHA-256: 261c6cd925066a0591a9175344fe33e0df3885595700a5c268fff6e747766cde
206 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external resources, with one specifically identified as a random, algorithmically-generated URL pointing to another PDF. This, combined with the 'link farm' heuristic and ClamAV detection, strongly suggests a malicious intent to redirect users to potentially harmful content. The document body is heavily obfuscated, preventing a clear understanding of its direct lure, but the overall structure points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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.
  • 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://nepalmicrofinancesummit.org/userfiles/files/29879370454.pdf In PDF document text
    • https://clubkdo.fr/img/pics/files/33894620796.pdfIn PDF document text
    • https://signika.pl/Upload/file/jirosufuxinavanixajapojor.pdfIn PDF document text
    • http://anm-av.de/uploads/files/24740460045.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/28284090998.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210911012605_pxk27e.pdfIn PDF document text
    • http://thrifthelp.com/flash/thrifthelp.com/file/befimiku.pdfIn PDF document text
    • https://phuquiland.com/upload/files/45938163815.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/29828497956.pdfIn PDF document text
    • https://ddtoyz.com/ckfinder/userfiles/files/50289038817.pdfIn PDF document text
    • http://slesnick.net/userfiles/files/626513778.pdfIn PDF document text
    • https://warungmimpishio.com/contents/files/38010182134.pdfIn PDF document text
    • http://bushurov.ru/images/files/mipufomeve.pdfIn PDF document text
    • http://beming.com/ressource/site-image/files/78023225097.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/fitexowovopisutefubezo.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/ribudijadororefujixi.pdfIn PDF document text
    • https://sona3elkhair.com/userfiles/file/6497163678.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613743945dd5b---73170727506.pdfIn PDF document text
    • http://lucidarepavimentimarmogenovaealessandria.it/userfiles/files/ronoreruraxeket.pdfIn PDF document text
    • https://xn--psg-9lac.hu/files/files/43728288694.pdfIn PDF document text
    • https://dermatologie-francophone.com/userfiles/file/72714192428.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///neseloxevusufamojanuzised.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=reading+a+qr+code+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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d69d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD69D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eeaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAF 17684 bytes
SHA-256: 01a3d931aaf462ea3435fdcec0b874835bb87a1b3a597c898df37f4c730b010a
font_02_sfnt_off00011ca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA1 10424 bytes
SHA-256: 8ff693606794f8b433c0fa00fcb6928ec3d938dd461d4d26626b4526ad866f29

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