Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3af5d5d20222598…

MALICIOUS

PDF

84.5 KB Created: 2021-03-08 00:41:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 6b8855398c9b29641f96cd30cfca9dc5 SHA-1: 9a9cd6b6f636cb2b94f513a2467692e7daa11e64 SHA-256: a3af5d5d202225989d1241615f0327106aaf3295cf169e769753ed08811f7d32
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The file is a PDF that contains numerous external links, many of which are part of a link farm designed for SEO manipulation. A critical heuristic identified a brand-impersonation lure for Gmail, directing users to a redirector URL that ultimately points to a PDF hosted on weebly.com. This strongly suggests a credential phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://xefanopebowemid.weebly.com/uploads/1/3/2/6/132681782/pafafijix.pdf.
  • 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://jottigo.ru/wix?keyword=practice+worksheet+graphing+exponential+functions PDF link annotation
    • https://cdn.sqhk.co/xovepejegosi/WhifNBs/artemis_spaceship_bridge_simulator_ios.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409814/normal_5fffcb0174113.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422906/normal_5feb158646e2b.pdfIn PDF document text
    • https://xefanopebowemid.weebly.com/uploads/1/3/2/6/132681782/pafafijix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494139/normal_6011c98f3c0b5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481828/normal_5ff073b0a6a7a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428033/normal_5ffe233ba7d60.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410414/normal_5ffc5506ba36c.pdfIn PDF document text
    • https://cdn.sqhk.co/xelajuwodaf/q1ijFge/retro_games_list_android.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469355/normal_5fcf021f24417.pdfIn PDF document text
    • https://cdn.sqhk.co/sosobita/qxWhiih/86956347614.pdfIn PDF document text
    • http://pidusejop.medianewsonline.com/v2490_foodsaver_manual.pdfIn PDF document text
    • https://tamegafatukof.weebly.com/uploads/1/3/4/4/134400059/7745805.pdfIn PDF document text
    • https://rijadotijijani.weebly.com/uploads/1/3/4/4/134470018/ditifeb_jawegekajel_kewexobilesetod.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/voropa/wijavudaxem.pdfIn PDF document text
    • http://xobibaga.myartsonline.com/nimisenukaju.pdfIn PDF document text
    • https://s3.amazonaws.com/jifesu/best_ad_free_alarm_clock_for_android.pdfIn PDF document text
    • http://gakilasefit.myartsonline.com/46811738001.pdfIn PDF document text
    • https://s3.amazonaws.com/sixolose/83465734819.pdfIn PDF document text
    • http://xobebol.onlinewebshop.net/vofir.pdfIn PDF document text
    • http://jimomurapujivo.onlinewebshop.net/boxibojiwananadowez.pdfIn PDF document text
    • https://s3.amazonaws.com/luxelula/mitsubishi_73_inch_tv.pdfIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F6 5384 bytes
SHA-256: 5255fe3d36e0743eeb1d59238b81007e1dfdd07f2f06b6d7f3d2b6edc8d9c6a2
font_01_sfnt_off0000fb50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB50 11004 bytes
SHA-256: b6c92043df3280b7b0f66da554f1fd087da5345bb722552e5437d35c653cbf7d
font_02_sfnt_off0001211d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1211D 16060 bytes
SHA-256: 713933360072c9d59346590fad668f98c3603c6d2b72ed941ce85481f6af0b74
font_03_sfnt_off000135af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135AF 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3