Malicious PDF — malware analysis report

Static analysis result for SHA-256 408969c89533420d…

MALICIOUS

PDF

77.3 KB Created: 2021-03-31 21:40:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: a469d750c6f7941d010387f931ee9726 SHA-1: cd3b781253ce537dc8a95773228ce5834367ce9a SHA-256: 408969c89533420d4306c5fc1e7e6db24c0db5ffe7af2fb990c0d93b73e288e8
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains and Weebly hosting, indicative of a link farm. The 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics confirm this behavior. ClamAV and ML classifiers also flagged the file as malicious, suggesting it may host or lead to malicious content, despite the lack of executable scripts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://zajinet.ru/award?keyword=pnaa+asma+2020+pdf PDF link annotation
    • https://sovopedu.weebly.com/uploads/1/3/5/3/135301682/9455996.pdfIn PDF document text
    • https://tizevilujiv.weebly.com/uploads/1/3/1/4/131406709/mokij_xakadinev.pdfIn PDF document text
    • http://taxokijoba.sportsontheweb.net/where_is_the_most_human_trafficking_in_the_us.pdfIn PDF document text
    • https://dotofinadi.weebly.com/uploads/1/3/0/7/130740455/271ca5.pdfIn PDF document text
    • https://sewizafisebe.weebly.com/uploads/1/3/1/4/131437566/bimabivenuzuwejilomi.pdfIn PDF document text
    • https://nisaxiguxizi.weebly.com/uploads/1/3/5/3/135306566/jerevusipu.pdfIn PDF document text
    • https://belukuxar.weebly.com/uploads/1/3/5/3/135312366/bizupi.pdfIn PDF document text
    • https://delazodudiz.weebly.com/uploads/1/3/4/5/134591817/7493510.pdfIn PDF document text
    • https://xetazegutim.weebly.com/uploads/1/3/4/7/134747192/kefufe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vuvumotelikev.rf.gd/tools_to_analyse_website_performance.pdfIn PDF document text
    • http://femejuzi.epizy.com/vigevuwirawibuselifol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4a6cf91-792c-4135-b323-a3eadab06636/tintin_books_ranked.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e752c216-ba97-4191-9bd5-3cc726786063/jokikexurapakazupomibewos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01001a81-48b3-4db1-8a63-7e7ec8fc2c39/rojajogewitogugowujam.pdfIn PDF document text
    • http://murapimopavopa.myartsonline.com/brooklyn_cyclones_schedule.pdfIn PDF document text
    • http://bawawajabatura.epizy.com/maryland_appellate_brief_format.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_off0000ee20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE20 5336 bytes
SHA-256: 371c211c485f1b497d650272cdd2e3c5ba53c02075fd53bd678b0aa267a7fec7
font_01_sfnt_off0001003e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1003E 11908 bytes
SHA-256: 06c441719085518a5ba18e43b68f5a41d2df88bc84c6b87ec05e3d9ef6ce5d4a

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