Malicious PDF — malware analysis report

Static analysis result for SHA-256 db90f038a2fab270…

MALICIOUS

PDF

78.0 KB Created: 2021-02-16 01:31:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 8c9b8315a17e05b42896b5df34879c73 SHA-1: 214cdf826cfb41930ed921cc3ec94d97933ff3e4 SHA-256: db90f038a2fab2701f13eb39b5e67a6063aed99ee5fc98d8a71a8a05cf8d46e1
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a mass of external links, many of which are SEO-themed and point to potentially malicious or phishing sites, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The primary URL, 'https://baarspo.ru/strik?utm_term=what+is+the+new+dance+craze', suggests a lure related to trending topics to entice users. ClamAV detection and ML classification further support its malicious nature, likely as a phishing or malware distribution vector.

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://baarspo.ru/strik?utm_term=what+is+the+new+dance+craze PDF link annotation
    • https://cdn.sqhk.co/baradudapati/ifnyjcT/zombie_strike_brainsaw_blaster_nerf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386361/normal_5feef946b830d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388405/normal_6009300f995c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405654/normal_60176bf6c12ac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419626/normal_5fefccd665cbd.pdfIn PDF document text
    • https://cdn.sqhk.co/borefigux/90GPwUw/wuretekubok.pdfIn PDF document text
    • https://cdn.sqhk.co/zanuvajebodu/ghjRpji/octopus_teacher_review_rotten_tomatoes.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366639/normal_5fdd3b5a3a467.pdfIn PDF document text
    • https://cdn.sqhk.co/pevedapev/viggi9t/archery_trick_shot_ideas.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427097/normal_5fe548bcd519f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420761/normal_600b54dfe0358.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486346/normal_5fe17fe00e964.pdfIn PDF document text
    • http://tofuvuniz.iblogger.org/bikunalidewatadifebi.pdfIn PDF document text
    • https://pobolibawawo.weebly.com/uploads/1/3/1/4/131437087/soxaperosoxenoxujuv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mufunalera.rf.gd/lava_song_violin_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/feborobegibew/can_bus_basics.pdfIn PDF document text
    • https://s3.amazonaws.com/satulibaren/tokev.pdfIn PDF document text
    • http://kirigawegugava.epizy.com/4280415572.pdfIn PDF document text
    • https://s3.amazonaws.com/lijulijowivaze/inequalities_on_a_number_line_tes_worksheet.pdfIn PDF document text
    • http://tikolikenugim.epizy.com/sarawa.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_off0000f3b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B5 5152 bytes
SHA-256: c4071d58e75dd54e1abae220614038342569609587461358f466f3025f4076e3
font_01_sfnt_off00010550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10550 10940 bytes
SHA-256: f312937815410b3cbcfdc7dce23a6bff0c90aa7ca24525c12c7d85db30dc6d1e

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