Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c50d9a1046b655d…

MALICIOUS

PDF

87.3 KB Created: 2021-03-03 02:22:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: db2b4326c018d254397de6b1b81e5137 SHA-1: 4e4cec1b969635942ee99284162a44068488c1f9 SHA-256: 8c50d9a1046b655d6c5d66058b9cab0e22b37d60330941314170a634a6f8168c
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF file flagged by multiple heuristics as malicious, including brand-impersonation credential phishing (Walmart) and a link farm. The presence of embedded URLs, particularly the one leading to a Weebly subdomain, strongly suggests a phishing attempt. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to redirect users to malicious sites, likely for credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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://komuwewolidixat.weebly.com/uploads/1/3/4/8/134871085/27d70f5.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://golowaki.ru/strik?utm_term=what+weight+oil+for+honda+odyssey PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4473947/normal_603ebd6f4ea35.pdfIn PDF document text
    • https://komuwewolidixat.weebly.com/uploads/1/3/4/8/134871085/27d70f5.pdfIn PDF document text
    • http://dle-tpl.site/blaze_obstacle_course_download_apkaeqs7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408706/normal_5fff3dab99b0a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369776/normal_5fede282d7e22.pdfIn PDF document text
    • https://pifabesi.weebly.com/uploads/1/3/5/9/135958575/5207380.pdfIn PDF document text
    • http://lamakexo.scienceontheweb.net/can_a_federal_judge_be_fired_by_the_president.pdfIn PDF document text
    • https://ladufuvugekowek.weebly.com/uploads/1/3/4/1/134108614/ff9341056ae01.pdfIn PDF document text
    • http://fakixigulidol.mywebcommunity.org/manual_radios_midland_gxt1000_en_espaol.pdfIn PDF document text
    • https://devigejijakefu.weebly.com/uploads/1/3/2/7/132740662/xumapow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421365/normal_603271c31a9ff.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494435/normal_5ff607e1c9dec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492250/normal_600a091e1240f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378852/normal_5fdac059395ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496001/normal_601da1607b859.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/zurovajij/android_tablet_for_sale_argos.pdfIn PDF document text
    • https://s3.amazonaws.com/damerirazib/gawazebomavovedow.pdfIn PDF document text
    • https://s3.amazonaws.com/gurupixabogivaz/vejiga_neurogenica_en_pediatria.pdfIn PDF document text
    • https://s3.amazonaws.com/wejuvono/chest_guidelines_for_management_of_pulmonary_embolism.pdfIn PDF document text
    • http://tavoxelelenasi.onlinewebshop.net/motorola_xts_3000_radio.pdfIn PDF document text
    • https://s3.amazonaws.com/pasawexawinogad/occupations_vocabulary_exercises_worksheets.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001085c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085C 5164 bytes
SHA-256: 04f0c5a7a2b9d77c362b1b67c3bb965b54a75df0cb9c2894b8bf0ab9fab28a17
font_01_sfnt_off000119fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119FB 11584 bytes
SHA-256: e4c274ab6d9aaebbfd2667c1998e0bdd6d27a80e005fec7b788721166ab3f9af
font_02_sfnt_off00014166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14166 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333