Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd57310409d82ccd…

MALICIOUS

PDF

75.5 KB Created: 2021-02-23 14:48:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: a7c270e3ea18281fc9ea28d66c1e89fc SHA-1: df561671909444ae568563c79fd9467bb7fd13ce SHA-256: cd57310409d82ccd643f17ee08c7b8c30a0fd74c09fbccd48b1e71a67a6b6486
184 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, specifically as a phishing or redirector threat. It contains numerous embedded URLs, with one prominent URL leading to a known malicious redirector infrastructure. The document body, though heavily obfuscated, appears to be a lure related to educational materials, aiming to trick users into clicking the malicious link.

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
  • 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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/wix?keyword=mcgraw+hill+5th+grade+math+book+volume+1 In PDF document text
    • https://sukanoxe.weebly.com/uploads/1/3/1/4/131453950/sitomoxen-lamijiwegiw-posodutivaxad-kijorofivur.pdfIn PDF document text
    • https://pagafika.weebly.com/uploads/1/3/5/3/135339488/baxijenu.pdfIn PDF document text
    • https://towutibe.weebly.com/uploads/1/3/4/0/134012467/fodedasirux.pdfIn PDF document text
    • https://bemozepe.weebly.com/uploads/1/3/0/7/130739793/9002ceee.pdfIn PDF document text
    • https://cdn.sqhk.co/zegareguw/xgdieha/92511617491.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459631/normal_5fcc00f79fb75.pdfIn PDF document text
    • https://dubobovutorikug.weebly.com/uploads/1/3/5/3/135332124/kudegubulagowedi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381321/normal_602898889c34b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fedure/munovofajekur.pdfIn PDF document text
    • https://s3.amazonaws.com/jivuxo/51660375626.pdfIn PDF document text
    • https://s3.amazonaws.com/furunumaroxun/esomar_annual_report.pdfIn PDF document text
    • http://lumigetutiburu.epizy.com/chloroform_spray_buy_online_snapdeal.pdfIn PDF document text
    • http://lofupiwosilabo.epizy.com/abdullah_ibrahim_the_wedding.pdfIn PDF document text
    • http://kojosire.epizy.com/kerala_flood_report_writing_100_words.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_off0000e929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE929 5712 bytes
SHA-256: 497df20a8ccf27435baf5a404d3c1ea452403670db8a60aeb21ab4932fa55776
font_01_sfnt_off0000fc9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9E 10620 bytes
SHA-256: 1075c600ee09cc23a6e33cc23fca9a0a868eb29a1c00eb44444c3c7919fad298

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