Malicious PDF — malware analysis report

Static analysis result for SHA-256 c03807d16cffeae9…

MALICIOUS

PDF

98.1 KB Created: 2021-09-20 00:59:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e843afc63b70773468360cc0667d2dfb SHA-1: 41a2534a270bd1b0206e09f95de0222783be08c1 SHA-256: c03807d16cffeae97ae216ccf0559e6c18184c2362961caece9b0261a49fba96
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one identified as a link farm on disposable hosting, suggesting an attempt to redirect users to malicious content. The file's structure and the presence of multiple unknown URLs indicate a likely phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 5

  • 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.
  • 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://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140f962c5f44---poxoketuwakix.pdf In PDF document text
    • http://ingegnasrl.com/userfiles/files/molixurezajawog.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161417a978e580---tigiwisi.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/bunomizupis.pdfIn PDF document text
    • http://handinks.com/ckfinder/images_store/files/simisubupawebafu.pdfIn PDF document text
    • http://chipmax.in/chipmax/ckfinder/userfiles/files/83053197099.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/levowoluvumaretujiw.pdfIn PDF document text
    • http://anindecor.pl/files/file/gifelorisasemipovare.pdfIn PDF document text
    • http://stroi-sistema.ru/img/2427611514.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/popuwetimosajomanopupeges.pdfIn PDF document text
    • https://aksukartela.com/images_upload/files/62624069079.pdfIn PDF document text
    • http://sameiroeventos.pt/ficheiros/37111802968.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109152320551827.pdfIn PDF document text
    • http://dopuskvsro.ru/UserFiles/84024367732.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///70563211954.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/sufowamarigugekibekik.pdfIn PDF document text
    • http://needychild.org/ckfinder/userfiles/files/nigalaluz.pdfIn PDF document text
    • https://foodexgida.com/uploads/files/41901038329.pdfIn PDF document text
    • https://codecs.ro/images/file/benubap.pdfIn PDF document text
    • http://eapver.com/upload/ckimg/files/202109190915556657.pdfIn PDF document text
    • http://kamakuralosgatos.com/uploads/files/81464271660.pdfIn PDF document text
    • http://onestep-tokyo.com/userfiles/file/54025474935.pdfIn PDF document text
    • http://eastcity.hu/ufiles/file/zixim.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/10388974634.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/64377967163.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=osrs+brutal+black+dragons+guidePDF 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_off00011848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11848 10904 bytes
SHA-256: 175ec9cd1621e1ebe2ccbcbcbb9f0a4b64645493e9f2b359e90e207951fca5c0
font_01_sfnt_off0001317f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1317F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14991 18608 bytes
SHA-256: ff3e72b5b066b8cc5ff87742195c04635a29a2283baad7774fcae1c57e83753c

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