Malicious PDF — malware analysis report

Static analysis result for SHA-256 93aa2743d5c41db7…

MALICIOUS

PDF

81.9 KB Created: 2021-05-06 16:06:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 606c9184e21a86d576ec1280a7dd697f SHA-1: 22840045d652116440a670202cc00f138ff038c0 SHA-256: 93aa2743d5c41db7a784cbde06dfbe178278f4444875a7bec95f9f357f373451
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 are dynamically generated or use numeric slugs, indicative of a link farm or SEO spam operation. One of the primary URLs, 'https://fokemale.ru/strik?utm_term=what+is+the+renaissance+period+in+art', suggests a phishing or malicious redirection attempt disguised as a search result. ClamAV detection and ML classification further confirm its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/strik?utm_term=what+is+the+renaissance+period+in+art PDF link annotation
    • http://chebsvet.ru/pugekuwepusafilogifsnm6n.pdfIn PDF document text
    • http://gepokupaburorew.mywebcommunity.org/bbc_compacta_class_11_english_solutions.pdfIn PDF document text
    • http://lngcliente.com/fraction_comparison_worksheets_grade_49w93f.pdfIn PDF document text
    • http://netlysy.online/download_the_big_bang_theory_season4xxbi.pdfIn PDF document text
    • http://cucoupon.info/los_100_verbos_mas_usados_en_ingles_regulares_e_irregulares1ub57.pdfIn PDF document text
    • https://gomimujexewawid.weebly.com/uploads/1/3/1/0/131070583/3200888.pdfIn PDF document text
    • http://bilkan.fun/wajatakufazfeddt.pdfIn PDF document text
    • https://weralafopibobal.weebly.com/uploads/1/3/4/3/134338927/cbfe8.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/xidazeze/chopsticks_sheet_music_easy.pdfIn PDF document text
    • https://4dd4a32c-aced-41d2-87e6-7ff9ca8080d7.filesusr.com/ugd/6d6f33_2459012ee9a74769b4f45ca1e38ddfef.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dowadotiju/the_innocent_man_netflix_imdb_parents_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/minabiwa/8689314690.pdfIn PDF document text
    • https://936c3399-7e57-4c84-b12c-1d92ab61c002.filesusr.com/ugd/e33828_3360ea5740a848be858f68fd83020693.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wolawatin/wozir.pdfIn PDF document text
    • https://s3.amazonaws.com/megelugik/banco_santander_app_apk.pdfIn PDF document text
    • https://dbba0f06-1911-40f0-8c80-a2638c7f81cc.filesusr.com/ugd/b13fd1_c0c47169d16a44f1807e08d55b859c3f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/serogajugomiji/ps_vita_pch_2001.pdfIn PDF document text
    • https://6afed14e-2b01-442b-8c2e-11a8a6f39965.filesusr.com/ugd/46a5ae_bbda925247f848758b116f184a2745dd.pdf?index=trueIn PDF document text
    • http://subogerilazelo.atwebpages.com/cell_cycle_control_mechanism.pdfIn PDF document text
    • https://s3.amazonaws.com/rexogeguxosix/tizemukepunog.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_off0000f754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF754 4928 bytes
SHA-256: 9da2b8ae8bb84c64ff2a31084d1eacf0479a13cb293f5e5334750f78d48ecd3f
font_01_sfnt_off00010805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10805 10660 bytes
SHA-256: 67eef731f914cc4b654700081ccb614048241e327e9c6d48bd0c0bf864645d52
font_02_sfnt_off00012c03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C03 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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