Malicious PDF — malware analysis report

Static analysis result for SHA-256 859439057edd739b…

MALICIOUS

PDF

73.9 KB Created: 2021-05-04 00:02:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 9bd396105cc779317fff0177e5bfd301 SHA-1: 2d32503c15d5e2d238afe1c2f7239dd638f71529 SHA-256: 859439057edd739b3feaebdfefbfbd342c16102ba260f7a4d33424eada3140ec
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classifier flagging further supports malicious intent. The document body, though heavily obfuscated, contains keywords related to Excel and power query, likely serving as a lure to attract users to click on the embedded malicious links.

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://jottigo.ru/strik?utm_term=excel+2013+power+query+merge+tables PDF link annotation
    • https://nezuvaju.weebly.com/uploads/1/3/0/9/130969963/ranaki-resopanoditawe.pdfIn PDF document text
    • https://galujamisone.weebly.com/uploads/1/3/1/8/131871568/8753863.pdfIn PDF document text
    • http://nupewijanetari.medianewsonline.com/jurnal_sarang_burung_walet.pdfIn PDF document text
    • https://vunisanelebori.weebly.com/uploads/1/3/3/9/133999195/kemewedeba_bokaj_bupelalugafe_vasavum.pdfIn PDF document text
    • http://zorovot.22web.org/gasexuzasizebow.pdfIn PDF document text
    • http://tigadugutuvatix.mygamesonline.org/alpha_omega_elite_car_seat_cost.pdfIn PDF document text
    • https://sutukedepebovi.weebly.com/uploads/1/3/4/7/134753024/2365747.pdfIn PDF document text
    • https://jezisivakutuxek.weebly.com/uploads/1/3/4/8/134862078/c3fbac55704b1.pdfIn PDF document text
    • https://sugokumorol.weebly.com/uploads/1/3/1/4/131437576/bujofupavazanenu.pdfIn PDF document text
    • https://dupukixulin.weebly.com/uploads/1/3/2/6/132681516/e403568.pdfIn PDF document text
    • http://lutirojibafap.sportsontheweb.net/melilifazitivebonawojigoz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jixopararaz.rf.gd/60755629941.pdfIn PDF document text
    • https://938a05da-450f-421e-a59b-0448473a402a.filesusr.com/ugd/cb5dea_344d7b5ea3444474a28facb88fa936f4.pdf?index=trueIn PDF document text
    • http://kunegozaribop.epizy.com/sasitetezupisorov.pdfIn PDF document text
    • http://pefasadidalaw.epizy.com/rejebupukalon.pdfIn PDF document text
    • http://kuwosuz.rf.gd/android_app_pending.pdfIn PDF document text
    • http://pozajuw.atwebpages.com/colors_of_the_wind_lyrics.pdfIn PDF document text
    • https://33b7cf8b-1cb2-46d9-9063-17e97cba5e80.filesusr.com/ugd/9edd50_da5f26cff5d444f197d75ba5ba5172c1.pdf?index=trueIn PDF document text
    • http://timerojulawu.myartsonline.com/bearing_false_witness_stark.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE184 6228 bytes
SHA-256: 243afeb15cd7b9f098fd8685894039030c17d6edebed99d8a110ae4a6992300c
font_01_sfnt_off0000f6c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C3 10632 bytes
SHA-256: d466c63a218f12363865cdb363d7ead3dbd9e5634b0e58a73226e6f639d0ba71

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