Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7ce19dd2de34455…

MALICIOUS

PDF

69.6 KB Created: 2021-10-02 20:56:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f7770fe646f9c31d2b08271620cb06b2 SHA-1: 66b36e15e0b011c1473d40a89563309861c19d71 SHA-256: e7ce19dd2de34455a03ee5ed1e5c11e75933efc61c0f03e8121f16de97c49551
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URIs and the link farm heuristic suggest the primary goal is to redirect the user to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://smenergy.kr/uploaded/file/1526061204614ccdf0379a8.pdf In PDF document text
    • https://orderpoet.com/ckfinder/userfiles/files/15836669322.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/32385814551.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/77391578985.pdfIn PDF document text
    • http://greenhere.cn/upload/ckimg/files/202110022123087597.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/60954507303.pdfIn PDF document text
    • http://topp.pl/_topp/file/31331657273.pdfIn PDF document text
    • https://wsbtitan.com/images/file/40350124283.pdfIn PDF document text
    • http://bckbytow.naszbip.pl/img/upload/files/zejudegafutukaj.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/wokivedifakaz.pdfIn PDF document text
    • http://avon-bratislava.com/files/files/zisozubun.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/genibuze.pdfIn PDF document text
    • http://kachelofen-prommegger.at/fovumokurinug.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/fexipokozopofig.pdfIn PDF document text
    • http://lamardaegu.com/upfile/user/file/seluwuxobigojewefe.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/37452492279.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/linakirakifodexomakomiva.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/nunovanumademadaropelu.pdfIn PDF document text
    • http://deauville.ru/files/file/52197360024.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/740eda5803e514b85eb0174b6fdca445/49507356898.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/roxavivitipubo.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/64730284452.pdfIn PDF document text
    • http://www.schule.havonix.com/ckfinder/userfiles/files/xujizudanexawez.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/balazedaxi.pdfIn PDF document text
    • https://mywayrtk.com/userfiles/file/nipamewazumerisegasoj.pdfIn PDF document text
    • http://bulmarconsult.com/files/nigomozififuti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=jointly+owned+property+inheritance+taxPDF link annotation
    • 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_off0000b224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB224 10736 bytes
SHA-256: c575c2e316f3951f1275ce970a82d197aefc18e3331cb228a2feb28724e06d63
font_01_sfnt_off0000cad7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e2e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E9 15140 bytes
SHA-256: 888361bd0202dc1fa13d6081044b7cc70ad247ab0bc11414e72842746d2e65a4