Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b13ec205b22af67…

MALICIOUS

PDF

84.0 KB Created: 2021-09-17 02:52:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 267d5a0765b4269c0272f468d3969c05 SHA-1: a5dd632cc7c04b0ebcdc50ec7c683aa3d908b349 SHA-256: 6b13ec205b22af67de83525418c09891dab98811045fbf389bb3c294480fc5f9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, presenting numerous links to other PDF files, likely as a lure to download further malicious content. The presence of embedded URLs and the overall structure suggest an attempt to trick users into downloading or accessing malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • 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://lamorenj.com/userfiles/files/25504423542.pdf In PDF document text
    • http://maivietnamesecotati.com/uploads/files/devininakadamogowinekuji.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/86534065114.pdfIn PDF document text
    • http://lexuspolymers.com/assets/ckfinder/userfiles/files/17599009260.pdfIn PDF document text
    • http://goldcoil.com/uploadfiles/files/71666371337.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/potavumugudu.pdfIn PDF document text
    • http://www.vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/10421897764.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/kigupobewidafisag.pdfIn PDF document text
    • http://tokyo-sanritsu.com/userfiles/file/bokulovogutatiruzotasev.pdfIn PDF document text
    • http://boxethai38.com/upload/file/73284742785.pdfIn PDF document text
    • https://lacausedeslivres.com/userfiles/file/68941634605.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/76995679581.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613433d0647fb---muwisewusewabalupufamiwez.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/wenib.pdfIn PDF document text
    • http://cpviettin.com/upload/files/93255157015.pdfIn PDF document text
    • http://topup-fight.com/ckfinder/userfiles/files/tafukovobip.pdfIn PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/62185307526.pdfIn PDF document text
    • http://geometracosentino.com/userfiles/files/39272933183.pdfIn PDF document text
    • http://htygroup.com/upload/files/11570877838.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/161394554a3b18---45417184785.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.com/ckfinder/userfiles/files/vujekidazukaxikorunowilu.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/lepekupewirerorum.pdfIn PDF document text
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/xuzekuvewixofi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=nom+019+stps+pdfPDF 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_off0000e1fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA12 10340 bytes
SHA-256: 049f943cfe9f5014a55adfdb870dad1767f1479a9555ccf44125cebeba781ad7
font_02_sfnt_off0001116f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1116F 18888 bytes
SHA-256: 0d6581f01171d74224d3ee72f1e3fde6117c5f6c241349f8c04c918e9f837b1b

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