Malicious PDF — malware analysis report

Static analysis result for SHA-256 c12ba7bdbc087d6d…

MALICIOUS

PDF

73.9 KB Created: 2020-11-10 21:47:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 4a3dd4867d7fb21c12baa4cfa1852db9 SHA-1: bd5ec829a272bf24b6a06bcebfc990b6492584c5 SHA-256: c12ba7bdbc087d6d6694cf20d8e165a8de17088e04904c08292260ca92410cf3
274 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains multiple embedded URLs that lead to known malicious redirector infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK and SE_BRAND_CREDENTIAL_PHISH heuristics. The ML classifier also strongly flagged this PDF as malicious. The primary goal appears to be credential phishing, impersonating Microsoft to lure victims into clicking on these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 6

  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://xidawelopumez.weebly.com/uploads/1/3/4/4/134439163/2c44a1e548115.pdf.
  • 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://cctraff.ru/strik?keyword=roadrunner+email+help In PDF document text
    • https://xidawelopumez.weebly.com/uploads/1/3/4/4/134439163/2c44a1e548115.pdfIn PDF document text
    • https://kevugekakizuxo.weebly.com/uploads/1/3/4/4/134481001/6008444.pdfIn PDF document text
    • https://doxeduzawixufak.weebly.com/uploads/1/3/4/3/134383044/0e3b72d970a2db.pdfIn PDF document text
    • https://zisogojevup.weebly.com/uploads/1/3/1/4/131453725/3322464.pdfIn PDF document text
    • https://vufevilasok.weebly.com/uploads/1/3/4/3/134314299/jaribasuve.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e16f0488-490d-4fd8-9888-d7594e9d206b/vubosoxibijevifulekazafur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db10e0d7-6185-46a6-a98a-ef67fd6b6ef7/what_are_colligative_properties_of_solutions.pdfIn PDF document text
    • https://s3.amazonaws.com/bopuxosavubare/cytoskeleton_and_extracellular_matrix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25a8ad21-b31c-414d-bbc3-0ecaa3723beb/wish_promo_codes_for_existing_customers_2020_free_shipping.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_off0000e529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE529 5028 bytes
SHA-256: 6870ec2c5bea7e7ee517e3d423348ad2eec570b6db5c20f552a85c63268554e4
font_01_sfnt_off0000f613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF613 10880 bytes
SHA-256: 702bd2f7ff51836a4ce86690db6b3ba6224b62dc04374266660bfeecfdfb4bf7

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