Malicious PDF — malware analysis report

Static analysis result for SHA-256 e628ca4254135fd6…

MALICIOUS

PDF

75.3 KB Created: 2021-03-25 10:46:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 0cdf42cbd4b8e9c357c0dea28b644e88 SHA-1: 117fad4baee87aa1f204e9908ef428e5a9d60e2d SHA-256: e628ca4254135fd6d0816e44d9ad986b73ecf408b1ea468dc06658568715d2c7
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many pointing to disposable hosting services, indicating a link farm designed to distribute malicious content or phish for information. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and numerous URLs point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://dugedepap.ru/strik?utm_term=algebra+with+pizzazz+did+you+hear+about+page+103+answers PDF link annotation
    • https://mitalukomajamo.weebly.com/uploads/1/3/1/4/131437074/mefilakoz.pdfIn PDF document text
    • https://nodepuje.weebly.com/uploads/1/3/4/5/134518199/vubuvibutameramiwix.pdfIn PDF document text
    • https://kulaxewanugig.weebly.com/uploads/1/3/1/3/131384484/wibegox.pdfIn PDF document text
    • https://nujazovarurep.weebly.com/uploads/1/3/1/8/131856890/jexonedozula.pdfIn PDF document text
    • https://cdn.sqhk.co/vujagefamig/CheoZhi/zeroxuf.pdfIn PDF document text
    • https://buniburus.weebly.com/uploads/1/3/1/6/131637527/8258245.pdfIn PDF document text
    • https://nusupubibirimu.weebly.com/uploads/1/3/1/8/131871553/zekijusonib-tunuwove-kiwepi-kusetetip.pdfIn PDF document text
    • https://xoxumowuna.weebly.com/uploads/1/3/5/9/135964844/wimakusuzuj-felegiz-fuguvunemijepe-waxatelagijuke.pdfIn PDF document text
    • https://cdn.sqhk.co/vafegijateno/jajjhjc/modern_sofa_table_lamps.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/00d14440-40cc-4bd0-b29e-5f0e0e082755/autocad_2018_tutorial_free_download.pdfIn PDF document text
    • http://lazubag.epizy.com/nunadupekirefuwelum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbd706df-bd74-4d76-b1df-70c3e1f148be/330518821.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72962462-d316-4d4f-8555-07b4430d6069/17598604904.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6762055-59df-4cf4-a5f5-cf38e914c90c/what_is_developmental_psychology_definition.pdfIn PDF document text
    • http://wanigag.rf.gd/rekoranamunej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6df0e336-3959-4b05-b222-60e30bfa43a9/kijedubijoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c08f6b5b-97fa-42ea-b4e3-d6f1db95924f/pagepajike.pdfIn PDF document text
    • http://sikofus.epizy.com/excerpt_from_self_reliance_answer_key.pdfIn PDF document text
    • http://vugikalijuboxo.epizy.com/71238350322.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9de2b4b4-947c-4804-b2a2-7bd0edd9b3f9/zifowinemoxudogivuvepagob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6859115-0e6c-46f1-a436-6c439d6c6e21/45768523674.pdfIn PDF document text
    • http://jimanujomubil.epizy.com/36701805264.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_off0000e960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE960 5952 bytes
SHA-256: 3ad71ab2efefc0ba50fb3ee9d572995eaf166196e13d8aa81dae081fa5696f94
font_01_sfnt_off0000fdba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBA 9956 bytes
SHA-256: cd9f9fbb0704563aca70ff02429b59803e189d6cba017c786ad92fccc921f951