Malicious PDF — malware analysis report

Static analysis result for SHA-256 d76cc53a897042c7…

MALICIOUS

PDF

81.7 KB Created: 2021-03-23 12:14:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: c0f28d84b585d50eab46cac50ac525e5 SHA-1: 11561c076b365ebf751bc504bbded45c346e2dd4 SHA-256: d76cc53a897042c70610c44c42cc20ace29d709f447fd4a40f81b8610f59c49c
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files, indicating a link farm or distribution network. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically phishing or trojan distribution. While no scripts were directly extracted, the PDF structure and numerous external links are indicative of a malicious campaign, likely involving the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 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.
  • 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://zajinet.ru/award?keyword=persuasive+essay+sample+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4450730/normal_5fcf9e97dc1c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380384/normal_603f95ed29401.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385613/normal_60451f11559a6.pdfIn PDF document text
    • https://xunopigiwigon.weebly.com/uploads/1/3/1/6/131636761/d3adab4.pdfIn PDF document text
    • http://fimunukowira.iblogger.org/hush_hush_becca_fitzpatrick_book_review.pdfIn PDF document text
    • https://mulononar.weebly.com/uploads/1/3/5/9/135959518/dadezugonoruwujupad.pdfIn PDF document text
    • https://lurefeti.weebly.com/uploads/1/3/4/6/134683691/2948163.pdfIn PDF document text
    • https://xisubuto.weebly.com/uploads/1/3/1/3/131380177/e9f98.pdfIn PDF document text
    • https://dugizixenopiloj.weebly.com/uploads/1/3/4/4/134457585/tepolukera_nowebilijewu_zuliru.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366637/normal_5fd9e8261a0ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476578/normal_5fe9622d18a9a.pdfIn PDF document text
    • http://dubejug.iblogger.org/dowuwenumelixixivexuna.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bisaxofawalep.epizy.com/paxosunotalozabudewufu.pdfIn PDF document text
    • https://s3.amazonaws.com/xovajukoxin/38288624382.pdfIn PDF document text
    • http://patabajisof.epizy.com/the_far_side_of_the_mountain_quotes.pdfIn PDF document text
    • http://zurutoraxavifes.rf.gd/payroll_management_software.pdfIn PDF document text
    • https://s3.amazonaws.com/widiku/gudeleziwigodib.pdfIn PDF document text
    • https://s3.amazonaws.com/fofeguj/xipawuxajomuzix.pdfIn PDF document text
    • http://buzelijakozesi.epizy.com/bell_bottom_kannada_full_movie_telegram.pdfIn PDF document text
    • https://s3.amazonaws.com/zemunomipazikez/physical_geology_1403_lab_manual_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/tesapibebujep/nudibukutapi.pdfIn PDF document text
    • http://nisogifamesada.epizy.com/pdf_viewer_plus_7.1_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/zepifudoxapo/ghostbusters_the_video_game_free.pdfIn PDF document text
    • https://s3.amazonaws.com/safago/zumobizapixosaketa.pdfIn PDF document text
    • https://s3.amazonaws.com/meludav/pikagisitimid.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000101a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A4 5352 bytes
SHA-256: 74c5c2f2292cd2b4ef5f882c6003b91308b2eb038e8d66a7eb357016c67be2fc
font_01_sfnt_off000113ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113CE 10468 bytes
SHA-256: 2f5cd15c8efdd240d515da4b037e2e353ddb99259a0ad3e522442c7f4d3b1f93

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