Malicious PDF — malware analysis report

Static analysis result for SHA-256 549bf34c9443028c…

MALICIOUS

PDF

95.8 KB Created: 2021-04-30 16:51:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: a7a878e35cf7335b9d09e78e4f6bfb9b SHA-1: e0135ddcd22779dea1c7af855b130e1b04edd2ff SHA-256: 549bf34c9443028c9112bfe0ffe93b563d90baebe0ac25d16fb26a9a887ea60b
184 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also flagged this PDF with high confidence. The document body, though heavily obfuscated, suggests a lure related to common English phrasal verbs, likely to trick users into clicking the malicious link. No scripts were extracted, but the primary attack vector appears to be social engineering via a malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=most+common+phrasal+verbs+english In PDF document text
    • http://jakufodunod.getenjoyment.net/advanced_statistical_analysis.pdfIn PDF document text
    • https://nexawukuvinu.weebly.com/uploads/1/3/4/5/134578226/3de01.pdfIn PDF document text
    • http://rowowesofazov.medianewsonline.com/2004_chevy_silverado_2500hd_duramax_diesel_owners_manual.pdfIn PDF document text
    • http://lotupojaxuvutix.mygamesonline.org/zerurube.pdfIn PDF document text
    • http://gusudula.iblogger.org/99825045967.pdfIn PDF document text
    • https://wisapemewe.weebly.com/uploads/1/3/4/7/134713478/1857a98.pdfIn PDF document text
    • https://konilusikiwi.weebly.com/uploads/1/3/3/9/133986353/8799966f.pdfIn PDF document text
    • http://zegererevez.medianewsonline.com/how_to_prepare_for_cfa_exam_level_1.pdfIn PDF document text
    • http://tedurelaseji.mygamesonline.org/vifoxu.pdfIn PDF document text
    • https://sikezenubotimer.weebly.com/uploads/1/3/0/7/130739875/wepagon_zowegetanasag_nufimolapar_vudosilo.pdfIn PDF document text
    • http://foselosen.sportsontheweb.net/exercicios_de_adjetivos_em_ingles.pdfIn PDF document text
    • http://xijonofupawulo.mypressonline.com/26566191874.pdfIn PDF document text
    • http://wipebodu.mypressonline.com/xurudukiwodeji.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xarojapi/binomial_theorem_class_11.pdfIn PDF document text
    • http://zodiripek.myartsonline.com/65066449677.pdfIn PDF document text
    • https://s3.amazonaws.com/fedure/87987373746.pdfIn PDF document text
    • http://fuzakumadobujav.epizy.com/abdul_hakim_murad.pdfIn PDF document text
    • https://s3.amazonaws.com/jusagi/fmla_guidelines_in_pennsylvania.pdfIn PDF document text
    • http://dezinolabebosod.atwebpages.com/47734919933.pdfIn PDF document text
    • http://naranosufok.atwebpages.com/91804738381.pdfIn PDF document text
    • https://s3.amazonaws.com/lomogas/pathophysiology_exam_1.pdfIn PDF document text
    • http://gebimosoruj.epizy.com/19915608109.pdfIn PDF document text
    • http://zakuvusebaj.epizy.com/vifebemiludamuzeveper.pdfIn PDF document text
    • http://dumevurofif.rf.gd/luligeno.pdfIn PDF document text
    • http://jujageritoxo.atwebpages.com/cch_chuyn_t_dng_nh_sang_word.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000122f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F1 5552 bytes
SHA-256: 1f64e43e1d0f5399632d4cc2030d469c4181d1a3da6b8d2e88ddea4b450cf18e
font_01_sfnt_off000135bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135BB 11380 bytes
SHA-256: 867bf5813efc4923f08feecd51de70fc2747b283d511e88b6d1b640cc427b6ec
font_02_sfnt_off00015bf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BF2 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15