Malicious PDF — malware analysis report

Static analysis result for SHA-256 0aa54f8624742ee4…

MALICIOUS

PDF

70.9 KB Created: 2021-09-25 12:58:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: bc2497647d74843cb3430365b9578283 SHA-1: e922d5ebb694e9111a919b28d5fc0f3b10a94e65 SHA-256: 0aa54f8624742ee497b6571743c485703e721a3bc5729b7072e9821de6fd39d1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many pointing to other PDF files on distinct hosts, indicative of a link farm. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the high ML score strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure itself is designed to lure users to external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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 http://www.siposferenc.hu/html/bolilowapefotid.pdf In PDF document text
    • http://superfasttv.com/uploads/files/gemumofiviketuzebuwane.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/1jsntm1fggmbknjh3tukcal1bc/popixonixiki.pdfIn PDF document text
    • http://wedooverseas.com/userfiles/file/54643003663.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140fde4af520---23294704991.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/8319090536.pdfIn PDF document text
    • https://pitbulllocksmith.com/nbloom/fckuploads/file/81128604354.pdfIn PDF document text
    • http://dongduong.net/Images_upload/files/roribefizajake.pdfIn PDF document text
    • https://linker.tw/files/50822740853.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/mujefufijexubososikeraza.pdfIn PDF document text
    • http://bdpq.hungminhits.com/files/uploaded/files/bovenabagutemaxen.pdfIn PDF document text
    • http://uralcomservis.ru/crn_fls/crn_files/95937657301.pdfIn PDF document text
    • https://amt-alarmy.pl/userfiles/file/fijilojosisipizarugagan.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210911155100.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/31394970114.pdfIn PDF document text
    • https://www.medicalbi.com/ckfinder/userfiles/files/rabesakesotuwozutexujanu.pdfIn PDF document text
    • http://laduses.nl/image/file/wafulaxufulogosigorote.pdfIn PDF document text
    • https://hiperaktivite.info/userfiles/files/20737374150.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/xuwinowuk.pdfIn PDF document text
    • https://phu-komplex.pl/pliki/file/tobumajejolugewobe.pdfIn PDF document text
    • http://aokunoil.com/ckfinder/userfiles/files/tezijemanalobalijada.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/dulalefugaveg.pdfIn PDF document text
    • http://ewtch.com/upload/files/juvokudafemodamap.pdfIn PDF document text
    • http://theaterbuehne-schwandorf.de/userfiles/file/lifulitexi.pdfIn PDF document text
    • http://gusanhightec.com/userData/board/file/93328507297.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=zelda+oot+3ds+romPDF link annotation
    • https://cakamuzejs.riga.lv/ckfinder/userfiles/files/89734806431.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://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_off0000b49f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB49F 16236 bytes
SHA-256: 4c3a2a2c360b709230a57eab9695719499015d4675c760c7ca07a1c6841bf870
font_01_sfnt_off0000de32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE32 10348 bytes
SHA-256: 880049ee4245ee6be6aaa0432305fd0116df3f05aaa73fd061369e446321305d
font_02_sfnt_off0000f5ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1