Malicious PDF — malware analysis report

Static analysis result for SHA-256 d21391377dd6ab83…

MALICIOUS

PDF

77.5 KB Created: 2021-04-18 22:06:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 0b5a536f58d975bc1f2244e1a45e8cab SHA-1: 41e846dae91dba11f24924423ed018d135b269c9 SHA-256: d21391377dd6ab83873601aa7f87edd1512f9e847e7bee30cf4c14463c96c223
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ClamAV and an ML classifier, indicating a high probability of malicious intent. It functions as a link farm, directing users to numerous external URLs, including the suspicious domain jottigo.ru, under the guise of search results for "First harry potter book release uk". The presence of many external links and disposable hosting suggests an attempt to distribute malware or conduct phishing by redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/strik?utm_term=first+harry+potter+book+release+uk PDF link annotation
    • https://bewevirat.weebly.com/uploads/1/3/1/4/131437926/62302d8f.pdfIn PDF document text
    • https://jelozenodi.weebly.com/uploads/1/3/0/7/130739120/tatukaxa.pdfIn PDF document text
    • http://rezisekuvaz.mypressonline.com/nevevi.pdfIn PDF document text
    • http://ayazshabutdinov.club/99832189268tnm15.pdfIn PDF document text
    • http://dapajurop.mygamesonline.org/abraham_lincoln_biography_kid_friendly.pdfIn PDF document text
    • https://rekaxarekarefov.weebly.com/uploads/1/3/5/3/135300852/simovasusive.pdfIn PDF document text
    • http://ompala.store/943187170334rpq9.pdfIn PDF document text
    • http://xruhdfo.site/free_calendar_template_2020_exceln75v3.pdfIn PDF document text
    • http://topcreditcheck.info/leburodosudofuduvpteg.pdfIn PDF document text
    • http://zonojebiridizo.mywebcommunity.org/42277024128.pdfIn PDF document text
    • http://wotamojami.22web.org/jewovopidilonevumof.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f06ae689-34e6-4fd9-b749-a5985747e370.filesusr.com/ugd/4117a9_0c66179ca2364d19b68c33e5161dd1e5.pdf?index=trueIn PDF document text
    • https://64f1e6a9-4530-4009-9f9b-67b91dd69f79.filesusr.com/ugd/76b6de_091b879e183b486ba57c55d0e6e0eb97.pdf?index=trueIn PDF document text
    • http://soxarigur.myartsonline.com/george_bridgman_descargar.pdfIn PDF document text
    • https://21e323bd-7fdd-46e9-a6c7-4880e76d7610.filesusr.com/ugd/0a51c1_7bcc8a87b87f4a61b76559c2f3ebba11.pdf?index=trueIn PDF document text
    • http://xewapumu.epizy.com/nalujazofamudesiluzovatop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e1ea080-0535-4f5e-b1b9-443337218ad1/summary_of_the_hound_of_the_baskervilles_chapter_4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2ef19ba-6796-4ec2-a7e0-a43fbb6f2965/ziliturolaw.pdfIn PDF document text
    • https://189c2d36-84ff-4b81-9465-96c33c1d3b91.filesusr.com/ugd/35ddae_367f1953a29a44538ef763fedd180798.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e370b2a-fc06-4fb0-92d8-2648ff417ff7/what_is_a_carriage_return_in_c.pdfIn PDF document text
    • https://8d90b851-447f-4cfc-ac95-1e867b71b983.filesusr.com/ugd/b371d9_b8e7f01a15e34c7e82c86dc6b372fca6.pdf?index=trueIn 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_off0000f0f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F0 5168 bytes
SHA-256: 7d7aa3a7230232e188b7f45752842dedfba2cd266fc81c45434ba93b402e2dc7
font_01_sfnt_off00010284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10284 11212 bytes
SHA-256: 5af7bbaeecb7e54f616eb87823ba74a4710f25c918b66456843a86bcd3fcf44a