Malicious PDF — malware analysis report

Static analysis result for SHA-256 9715f8c459e0b51a…

MALICIOUS

PDF

82.1 KB Created: 2021-04-04 01:32:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: b19cfe3e68858635e93b39d27244159b SHA-1: 552c3acf534fd9b1e748593aeaedc91f22ddc537 SHA-256: 9715f8c459e0b51ae02d86aeebef3ae5ccf7afbf89316cff3a7abe8689aab19d
164 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many of which point to other PDF files, indicating a link farm for SEO manipulation. The presence of a 'download button' heuristic and a critical ClamAV detection for 'Pdf.Phishing.Trojan' further supports a malicious intent. The ML classifier also strongly flagged this PDF as malicious. The embedded URLs likely serve as lures to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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 https://nipisod.ru/123?utm_term=business+vocabulary+in+use+audio PDF link annotation
    • https://jorikune.weebly.com/uploads/1/3/4/3/134371696/jonuwupipagu.pdfIn PDF document text
    • https://mamowolo.weebly.com/uploads/1/3/4/7/134714390/3814054.pdfIn PDF document text
    • https://xowuxuwakewobi.weebly.com/uploads/1/3/4/8/134853014/642835.pdfIn PDF document text
    • https://fikelepokaretes.weebly.com/uploads/1/3/1/3/131397971/2794173.pdfIn PDF document text
    • https://wopopodixela.weebly.com/uploads/1/3/0/9/130969383/c0c121e36be9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380674/normal_6067a90c52f5d.pdfIn PDF document text
    • https://neposuxanu.weebly.com/uploads/1/3/0/7/130740617/5377337.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462681/normal_5ff7eacba0766.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fedufiporara/financial_reporting_notes_ca_final.pdfIn PDF document text
    • https://s3.amazonaws.com/sabegokek/my_cousin_rachel_review_book.pdfIn PDF document text
    • https://s3.amazonaws.com/wemazun/tomokuxawutunefepob.pdfIn PDF document text
    • https://s3.amazonaws.com/lonozote/linked_list_in_data_structure_interview_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/rovikibixu/anatomy_and_physiology_test_1_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/viboxikuz/97438273464.pdfIn PDF document text
    • https://s3.amazonaws.com/dubiditiginowo/28023558279.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisigetizoxif/13909041919.pdfIn PDF document text
    • https://3abcc933-4059-444f-8e65-7077e95f005f.filesusr.com/ugd/44645f_8f0e41aa96d141ef866890d6ba17a98a.pdf?index=trueIn PDF document text
    • https://48b7024d-7414-4593-b44d-ed892b96ad15.filesusr.com/ugd/3e5db3_027d40d24fab49dba45cec882cddafaf.pdf?index=trueIn PDF document text
    • https://314f4944-3dd9-45af-b5ee-fc7f46c963e4.filesusr.com/ugd/73cb9e_162b47e7fa124046a2213e6d0ec388d2.pdf?index=trueIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BC 5284 bytes
SHA-256: f005e7002975825094197d5f15490358a8ec79c290711abadaa4d56904b2275c
font_01_sfnt_off000106ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CE 16276 bytes
SHA-256: fc3837f8cbab4cf0eb91ef66f0f2882d1c60d118e0720b7c127e68426296a03c

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