Malicious PDF — malware analysis report

Static analysis result for SHA-256 13ca62ffbf04df0a…

MALICIOUS

PDF

181.7 KB Created: 2021-04-18 15:15:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 5bdf3cb0f123ea20044d09b7da0b7d30 SHA-1: b520914d744943405b6bb777fcc1ce343b33d08c SHA-256: 13ca62ffbf04df0af604eabaa1bf7348a5ac645794e5e917bbd6f8602b2b9732
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting services, suggesting it functions as a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically identifies this pattern. While no scripts were explicitly extracted, the presence of external URIs and the overall structure point towards a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://xajibur.ru/strik?utm_term=washington+dc+population+density+map PDF link annotation
    • https://bevereka.weebly.com/uploads/1/3/0/7/130739533/c365a5a1.pdfIn PDF document text
    • http://20970907.net/wovewiwiwujijzy7p4.pdfIn PDF document text
    • https://sotinele.weebly.com/uploads/1/3/4/6/134640455/3c335b0fd48e6.pdfIn PDF document text
    • http://znatural.space/66784692957nx4n0.pdfIn PDF document text
    • https://lazekikobetilof.weebly.com/uploads/1/3/4/4/134443651/ximiroduluvakana.pdfIn PDF document text
    • https://totidulabi.weebly.com/uploads/1/3/1/6/131606487/garom_forerilel.pdfIn PDF document text
    • https://roxomikanu.weebly.com/uploads/1/3/0/8/130873860/rokotizi_mewuwig_jaboda_wubuxelebopuv.pdfIn PDF document text
    • http://yandex-delivery.cc/predicacin_cristiana_el_poder_de_la_oracinatm77.pdfIn PDF document text
    • https://lilepixot.weebly.com/uploads/1/3/4/4/134462463/xuxezafoladedi.pdfIn PDF document text
    • https://buvosaxemapo.weebly.com/uploads/1/3/1/4/131437370/7b19e2d1af828.pdfIn PDF document text
    • http://gopusoduj.mygamesonline.org/how_to_expand_french_vocabulary.pdfIn PDF document text
    • https://fizokufewof.weebly.com/uploads/1/3/4/0/134096090/jefowiret.pdfIn PDF document text
    • http://storeeuro.info/2012_chevrolet_silverado_1500_for_salelrwe1.pdfIn PDF document text
    • https://kubazabuz.weebly.com/uploads/1/3/4/8/134885093/mutileropojuzokanati.pdfIn PDF document text
    • https://kokesekodabese.weebly.com/uploads/1/3/4/0/134012443/zewuteros_fedofifofalate.pdfIn PDF document text
    • http://mon-cmb.best/reforming_of_petroleumqqfn8.pdfIn PDF document text
    • http://checkmycredit.info/scag_freedom_z_baggerhmtrx.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://95c758d6-fd33-43c6-b5d0-f1f55e07e946.filesusr.com/ugd/cb0188_59e616d0645f414b8cbbe7388adbb648.pdf?index=trueIn PDF document text
    • https://36c7e617-1221-4173-b726-d5bce2878801.filesusr.com/ugd/610d21_4baa15333e6d4ea6bff6f1fc3bf12448.pdf?index=trueIn PDF document text
    • https://1f53f175-067f-4140-b001-f66bebc9855b.filesusr.com/ugd/c711d8_99a862d02dd04719926a36a5b08b30cd.pdf?index=trueIn PDF document text
    • http://zilisidojaze.myartsonline.com/tifuxuxuta.pdfIn PDF document text
    • http://widepidaba.atwebpages.com/dakarimidew.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000267d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x267D0 5388 bytes
SHA-256: 9428449e7666b43be876116b610af96f12b4bcbbb9236390f7370881f5f60aa9
font_01_sfnt_off00027a06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27A06 13204 bytes
SHA-256: b3880c4f8f5b5a14c7d27c2017738fb9d12a8a657d8a775e77e315a8c4df1559
font_02_sfnt_off0002a5eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A5EB 16060 bytes
SHA-256: 2173a1880e9f774f759393e7d0d28dda91d04d8a3eae6bea41b822770b343b90
font_03_sfnt_off0002ba82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2BA82 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333