Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd61df9a7b849560…

MALICIOUS

PDF

75.0 KB Created: 2021-01-24 12:11:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: a55079e335aa9dae3d1f421072497cd3 SHA-1: 0d64006501f16565db81bad5ab202e34e5ddb69f SHA-256: cd61df9a7b849560a3b45285f6f0faec33c63b83cb9b4d78567cce3a66880f35
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to known malicious redirectors or link farms, indicating a phishing or malware distribution attempt. The heuristic firings for 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' strongly support this conclusion. Although no scripts were explicitly extracted, the structure and URL content suggest an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/123?utm_term=nest+learning+thermostat+3rd+generation+manual+pdf In PDF document text
    • http://cybety.xyz/free_download_dirt_xtreme_mod_apk3za6p.pdfIn PDF document text
    • http://good-production20.site/retro_frog_welliesdsf7v.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367303/normal_5fca7a2caa0f7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462036/normal_5fcf028d6ce7a.pdfIn PDF document text
    • https://cdn.sqhk.co/goberirud/v3pijdj/get_acc_e55_orange_valve.pdfIn PDF document text
    • https://cdn.sqhk.co/saboxiwago/0igjjbr/oceanhorn_apk_mod_money.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445731/normal_5ffd5aebaf454.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471686/normal_60003f5f7054d.pdfIn PDF document text
    • http://ukranews.site/lingo_the_word_gamert53mb.pdfIn PDF document text
    • https://cdn.sqhk.co/sarokuneti/dKgchia/hepatitis_a_b_c_symptoms.pdfIn PDF document text
    • https://rezodipegizosif.weebly.com/uploads/1/3/1/6/131606434/mijitewerebo.pdfIn PDF document text
    • https://ketumumev.weebly.com/uploads/1/3/5/3/135348104/revavokixezu_fogep_gofusimebir.pdfIn PDF document text
    • https://laropavo.weebly.com/uploads/1/3/4/5/134585926/3460368.pdfIn PDF document text
    • https://womomoko.weebly.com/uploads/1/3/4/8/134848640/wamujoxozi_wovimiju_nomogexivebanek_fanizuzenamopa.pdfIn PDF document text
    • https://cdn.sqhk.co/bogulevim/jghjhj7/pixel_car_racer_unlimited_mod_download.pdfIn PDF document text
    • https://gavuzolarot.weebly.com/uploads/1/3/4/4/134458525/6051545.pdfIn PDF document text
    • https://buwigare.weebly.com/uploads/1/3/5/3/135308802/tebexe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE788 5588 bytes
SHA-256: 5d03cbaec052710c71828d26d92652f7872a2e555e9ced21c24cabc6a5227ea0
font_01_sfnt_off0000fa64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA64 10668 bytes
SHA-256: a1f3a6b864045cc469ab934f4eb43ac620afa363dcdb8bfe02e5218e7aab0b11

Open this report in the interactive analyzer, or submit your own file for analysis.