Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa188437a42e06f2…

MALICIOUS

PDF

97.5 KB Created: 2021-03-30 15:01:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 9f74c89b4b3477a5278414cb232f2cc9 SHA-1: fe17c1664dc32a9f6272411f36a523bc9f1047f1 SHA-256: aa188437a42e06f2d127e0a9af21a81db0e33a1d4dd8d09b7deed0bc3ff271ba
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, with at least one pointing to a suspicious domain ('mezovuduw.ru') and another to a link farm ('gixapedotamerow.mywebcommunity.org'), suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated, but the presence of external URIs and link farm indicators strongly suggests the document's purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • 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://mezovuduw.ru/strik?utm_term=you%2527ll+be+great+meaning PDF link annotation
    • http://gixapedotamerow.mywebcommunity.org/16416023806.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491969/normal_5ff9918f2c213.pdfIn PDF document text
    • https://cdn.sqhk.co/folamudoj/bjd5cbR/vat_refund_calculator_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/baxijaxazixi/ZheidAO/81396222050.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423166/normal_6007afd350d0d.pdfIn PDF document text
    • https://cdn.sqhk.co/zumumolebajo/ejhZifg/headrush_looperboard_vs_boss_rc-_300.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368781/normal_604977f884236.pdfIn PDF document text
    • http://viwudij.22web.org/77139412093.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/wizedumi/38058262600.pdfIn PDF document text
    • http://vomogowejupilu.rf.gd/gijonemimipipabipus.pdfIn PDF document text
    • http://tipokeviti.atwebpages.com/agronomic_practices_in_maize_production.pdfIn PDF document text
    • https://s3.amazonaws.com/vaxebisapesi/copytrans_photo_crack_2018.pdfIn PDF document text
    • http://sotexazonilot.rf.gd/apple_developer_software.pdfIn PDF document text
    • http://fawibamawepud.rf.gd/jejuledutokafaditusulij.pdfIn PDF document text
    • http://fizufizobizud.epizy.com/vonikenofarubonutogaxe.pdfIn PDF document text
    • http://jiwenufaxo.epizy.com/never_break_down_movie.pdfIn PDF document text
    • http://rusesav.rf.gd/greenery_football_game_apk.pdfIn PDF document text
    • http://kavobomuvaweg.epizy.com/fillable_template_word_2013.pdfIn PDF document text
    • https://s3.amazonaws.com/sedimeraxufi/2211341202.pdfIn PDF document text
    • http://vawomebez.rf.gd/77092998237.pdfIn PDF document text
    • http://wesafisuki.epizy.com/mujuzuzifi.pdfIn PDF document text
    • https://s3.amazonaws.com/pafiganovavi/zamejumobebisabamak.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000118b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B8 6804 bytes
SHA-256: d83e330388675550f04341f5594315fba05065449f8c2361b360f3ba6b4c503a
font_01_sfnt_off000129f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129F1 4960 bytes
SHA-256: a9f5bc0d882a55fb322f3c0a032261dcdbb142be80fc51c0d40ecd253df6cf3d
font_02_sfnt_off00013aca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ACA 11484 bytes
SHA-256: 1c86cb0442797d9aaf4e5701cce2d2f1198b10383195df41f8ae11be3f3697ad
font_03_sfnt_off00016106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16106 16492 bytes
SHA-256: eca83ba0c726b96b99a8a767537d46a242cbf573efb99f09ffd941e2211c2eee