Malicious PDF — malware analysis report

Static analysis result for SHA-256 d42e9f01c55070c7…

MALICIOUS

PDF

79.7 KB Created: 2021-03-04 02:52:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 58130ed33534f30c4b2f42285c75f32b SHA-1: 24ce427187ad1e24a77cf5fc8e644b284d733704 SHA-256: d42e9f01c55070c734362d0270f50442d90594d0a7272fa86ae381355c34daad
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://fokemale.ru/123?utm_term=what+are+the+7+essential+life+skills+for+adults PDF link annotation
    • https://tupirusu.weebly.com/uploads/1/3/4/7/134702138/5066240.pdfIn PDF document text
    • https://pojewesam.weebly.com/uploads/1/3/1/4/131410485/tudizo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385647/normal_60126a6ed5886.pdfIn PDF document text
    • https://vadutebo.weebly.com/uploads/1/3/4/8/134889136/7e13a.pdfIn PDF document text
    • https://nitogufufuwal.weebly.com/uploads/1/3/3/9/133997090/reneze_rewipid_musalaxun_feluwodoxakuwu.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/wazorixekunafob/alp_answer_key_2018_in_tamil.pdfIn PDF document text
    • https://s3.amazonaws.com/jijumupade/compound_noun_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/gebukil/why_is_my_hot_water_not_hot_anymore.pdfIn PDF document text
    • https://s3.amazonaws.com/kifutizijebuj/majosikumowuje.pdfIn PDF document text
    • https://s3.amazonaws.com/fogibi/11477542799.pdfIn PDF document text
    • https://s3.amazonaws.com/tokafanawa/l_acoustics_preset_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/jadere/life_is_beautiful_songs_kannada.pdfIn PDF document text
    • https://s3.amazonaws.com/figugipopar/wijudijowirenopologadob.pdfIn PDF document text
    • http://lelirovosas.epizy.com/irony_worksheets_8th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/fusidejebi/zisixewepebutasurimu.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_off0000ebca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCA 5036 bytes
SHA-256: 51fb700d934458f94a618c564b010e03d70055bf9e8cebb9f47428b456c75d60
font_01_sfnt_off0000fcf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF3 11256 bytes
SHA-256: ac1eda459fa42bb3e04c9a56ae3948d49c27eb99f534e84d86e9bccb6f8f9439
font_02_sfnt_off0001234e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1234E 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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