Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a3943dd18c7c797…

MALICIOUS

PDF

82.0 KB Created: 2021-03-25 18:53:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: cca809051e9945bfbf92dd10245985b9 SHA-1: 5f3695211bfc5abdd6f3f603d05b9c075bf99e84 SHA-256: 6a3943dd18c7c797fdfb5472e2972cb28c9de82d1bfdb11d9075a72b047059c0
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or redirection scheme. The primary purpose appears to be directing users to external URLs, potentially for phishing or malware distribution, as indicated by the ClamAV detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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.
  • 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://jottigo.ru/wix?keyword=apk+infinity+display+pro PDF link annotation
    • http://tasonilevibinu.22web.org/75997976124.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393179/normal_5fe767c367a39.pdfIn PDF document text
    • https://xironudobavus.weebly.com/uploads/1/3/4/4/134461104/5cc04ec8fabd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422163/normal_604d863f83b5a.pdfIn PDF document text
    • https://zugowexilib.weebly.com/uploads/1/3/5/3/135349829/fanumakadogodi.pdfIn PDF document text
    • https://nikudedixipapun.weebly.com/uploads/1/3/4/6/134692686/jurizopalesig-rajotakelurof-wemozakef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366662/normal_5fe11173631d6.pdfIn PDF document text
    • https://jinepesel.weebly.com/uploads/1/3/5/3/135346763/5490386.pdfIn PDF document text
    • https://wosixuluwur.weebly.com/uploads/1/3/1/0/131071196/4547933.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483089/normal_60292e5fadf3b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447878/normal_5fc725b7961c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416139/normal_604c9fc598328.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/2b4e5960-ba39-4b45-9fe1-e36e4ab16653/zekixoxujod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf6c337d-1be2-439e-9c8d-4c7ec5efb70a/aws_cloud_security_certification_path.pdfIn PDF document text
    • http://judiwotilo.epizy.com/visual_basic.net_2008_free_download_full_version.pdfIn PDF document text
    • http://boxogegifenefi.epizy.com/femimunudegepe.pdfIn PDF document text
    • https://s3.amazonaws.com/sefepugolupalax/57650712090.pdfIn PDF document text
    • https://s3.amazonaws.com/wujanozo/zivajesepatepixoputenu.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE488 5188 bytes
SHA-256: 0a68a0a39801548edca0d5437b88b184953d9588b8dcf991d9e4dd57e1227d06
font_01_sfnt_off0000f644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF644 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off0000fed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED1 10952 bytes
SHA-256: 12ae19d0204921c601868f9011da1e3b26a7179334928f9f0b1159126c855159
font_03_sfnt_off000124aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124AA 16340 bytes
SHA-256: 4f9bddd8120402856594b33adaeac6aa436e26f5eb63b748bf1666df64cd7ce8