Malicious PDF — malware analysis report

Static analysis result for SHA-256 474200acb2992cc4…

MALICIOUS

PDF

75.9 KB Created: 2021-04-11 20:30:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: e7aac69942ec3b8af3a7bb5acd4818b2 SHA-1: 22626e830251d48906c37722d36af9186bc9dee1 SHA-256: 474200acb2992cc41a5797ed54987d6675c9f211d83da44b88d9e20529f5e539
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. The primary malicious URL identified is https://druttle.ru/strik?utm_term=quadratic+formula+factoring+worksheet, which likely serves as a redirector to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/strik?utm_term=quadratic+formula+factoring+worksheet PDF link annotation
    • http://xofutumokegabix.22web.org/western_blotting_steps.pdfIn PDF document text
    • https://letolonenuxe.weebly.com/uploads/1/3/4/0/134095956/a003528dd56228e.pdfIn PDF document text
    • https://fojowixejomad.weebly.com/uploads/1/3/2/6/132681658/baxinat.pdfIn PDF document text
    • https://fezojobuxaboxo.weebly.com/uploads/1/3/1/0/131070559/1463874.pdfIn PDF document text
    • http://surisetufuna.iblogger.org/nimemibopigevixoja.pdfIn PDF document text
    • https://ximesadi.weebly.com/uploads/1/3/0/9/130969353/ripela.pdfIn PDF document text
    • https://jedexapotup.weebly.com/uploads/1/3/4/4/134472831/2323169.pdfIn PDF document text
    • http://narelavupes.22web.org/school_year_calendar_template_2019-_20.pdfIn PDF document text
    • http://registrat.space/xikil4w5gl.pdfIn PDF document text
    • http://azules.ru/52116409405npv6u.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0df22b04-17ae-4e65-9af8-3af4445b4601.filesusr.com/ugd/71fd01_946a22ac5ce24198aca9592954f0c26d.pdf?index=trueIn PDF document text
    • http://xupudajiwozov.epizy.com/56270781480.pdfIn PDF document text
    • https://s3.amazonaws.com/wemazun/18531806629.pdfIn PDF document text
    • http://vexukaxazixaxet.epizy.com/19037343483.pdfIn PDF document text
    • http://gotenekopibijo.epizy.com/cdc_skin_cancer_prevention_guidelines.pdfIn PDF document text
    • https://df256b98-640c-444d-885a-8195c7360722.filesusr.com/ugd/40b9e6_5fa51edc7c5e40c6a98cba4b53565203.pdf?index=trueIn PDF document text
    • http://bilurosekina.rf.gd/vefewizosopavizixowo.pdfIn PDF document text
    • https://s3.amazonaws.com/gedexim/81365640829.pdfIn PDF document text
    • https://42172c5f-463d-425f-bc49-3536d5e9b788.filesusr.com/ugd/3e9aab_c1092a7d165e49ffb90b90e4a4952934.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_off0000e8de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DE 5652 bytes
SHA-256: 65aa97485063747804958473c2307223d7c4550e152a2183bfe5d758b696fa41
font_01_sfnt_off0000fc07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC07 11192 bytes
SHA-256: 350e4b3ed2502b58ff91c4ca20d323aad5435b5fa37fd3bd77c81bb22a8f1bb5

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