Malicious PDF — malware analysis report

Static analysis result for SHA-256 041721dc60fe431f…

MALICIOUS

PDF

67.0 KB Created: 2020-12-19 19:45:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: a38fe733fc2cdf821fbd8e18d9050522 SHA-1: e683f92bc1adcb1dcaff29c659a5209cba66285e SHA-256: 041721dc60fe431f484b84b36bccfdd445740ba26111226d176b10e71815d131
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains numerous embedded links, with at least one identified as a malicious redirector. The heuristic firings indicate a malicious redirector and a link farm, suggesting the document's primary purpose is to drive traffic to potentially harmful sites. The ML classifier and ClamAV detection further support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffmen.ru/aws?utm_term=belly+fat+reduce+workout+video In PDF document text
    • https://static.s123-cdn-static.com/uploads/4417528/normal_5fca96357cc7f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368954/normal_5f8880049fc54.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493201/normal_5fb9780a20880.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386842/normal_5fc45bdbe1063.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482208/normal_5fbea449cc1e1.pdfIn PDF document text
    • https://buranujepexu.weebly.com/uploads/1/3/4/3/134339299/a2a3e893e14.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374211/normal_5fce30bf2d5f5.pdfIn PDF document text
    • https://vijejomikozo.weebly.com/uploads/1/3/4/6/134668467/vutevajofufug.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/vonuxagupeduze/anganwadi_delhi_vacancy_online_application_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd2dbb8b-6f6f-489e-81ed-4979f705e5cd/80128859141.pdfIn PDF document text
    • https://s3.amazonaws.com/vebisop/excel_budget_template_for_event.pdfIn PDF document text
    • https://s3.amazonaws.com/posufij/caste_certificate_application_form_bihar.pdfIn PDF document text
    • https://s3.amazonaws.com/foneniz/42477851677.pdfIn PDF document text
    • https://s3.amazonaws.com/feseni/zufafowerogofomegejuzexem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3afa68ee-7d22-44f4-86d2-73e1ed474acd/vuzibesezofoxuvusumafukun.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9CA 5204 bytes
SHA-256: c4e9f6f61c3049eacd1f98c676945732134dfe36b993b53504c2d0ad0f4bdb1f
font_01_sfnt_off0000dbb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB4 10384 bytes
SHA-256: e2f78236f66485094526bf2db832ff7c81e0a63876207c44280d6c4d1fe1ed03

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