Malicious PDF — malware analysis report

Static analysis result for SHA-256 51cdbe1a32012efe…

MALICIOUS

PDF

81.4 KB Created: 2021-03-29 15:48:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 189a53228d7b3de569b90df9f335d3bb SHA-1: b0f52f27ab61b77a720620a65759e3307ecb5648 SHA-256: 51cdbe1a32012efedb082d1860fafe5957546f1b53a96fcd5790fd4fd1fdfafc
126 Risk Score

Malware Insights

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

The file is a PDF that contains numerous embedded URLs, many of which are hosted on disposable domains or link farms, indicating a phishing or spamming campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://bologen.ru/award?keyword=psychology+exam+questions+pdf PDF link annotation
    • https://cdn.sqhk.co/vekokoze/zzjhXif/briova_specialty_pharmacy_forms.pdfIn PDF document text
    • http://rezubodojel.medianewsonline.com/turovupeboxakaxoronogid.pdfIn PDF document text
    • https://cdn.sqhk.co/wixefawoz/dRIsMhh/basketball_rules_time_in_key.pdfIn PDF document text
    • https://cdn.sqhk.co/labifikup/gkOrJhd/xafozizetedoxawuwesi.pdfIn PDF document text
    • https://cdn.sqhk.co/suwuwewazaka/ehgVN2B/69447516969.pdfIn PDF document text
    • http://fuxisileza.mywebcommunity.org/63548946794.pdfIn PDF document text
    • https://cdn.sqhk.co/samumosoxivi/nRdjfif/44880624533.pdfIn PDF document text
    • http://xatakafigudu.getenjoyment.net/tizibisidosowalefilojir.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448115/normal_5ff7cabc040b7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401517/normal_5fe556cf57949.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453100/normal_604aaff132a51.pdfIn PDF document text
    • http://viruxego.mygamesonline.org/lodomopib.pdfIn PDF document text
    • https://cdn.sqhk.co/bowewulaxam/thf3Ujj/78135217238.pdfIn PDF document text
    • http://liniwugo.iblogger.org/20733986583.pdfIn PDF document text
    • https://cdn.sqhk.co/nipigagavadu/jidFjeF/xtreme_jet_boat_ibiza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486220/normal_5fdc7b76d4b8d.pdfIn PDF document text
    • https://cdn.sqhk.co/lasanamemego/jidjajd/wafufatemivowazizugab.pdfIn PDF document text
    • https://cdn.sqhk.co/pobumepova/hhgfhaK/washington_state_hockey_jersey.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379720/normal_5fdc03223fb47.pdfIn PDF document text
    • https://cdn.sqhk.co/busoleva/LGP2ghU/superhero_logos_hd_wallpaper_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454290/normal_5fe139f219ff8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zudosikewemer.epizy.com/54130612923.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_off000100d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D3 5768 bytes
SHA-256: 9fcfedc6e5a293fb93dc25f1a99b92f1c2a0ed16c79c61db85e6c454779e61db
font_01_sfnt_off00011460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11460 10576 bytes
SHA-256: 9ad053db1dd2c27856628c2257469b55ee23e2f236a696812675cc342bfe4141

Open this report in the interactive analyzer, or submit your own file for analysis.