Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b30dc3abb67b42e…

MALICIOUS

PDF

83.0 KB Created: 2021-09-14 00:15:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 316879d5842e151a46a9401cdc5a5289 SHA-1: ececcf94e3548c2b54acbaaa8a0f757d9112de4e SHA-256: 9b30dc3abb67b42ea3f58c0c9cbaa67502955361da827ab8a8d806d455393bd9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, with a high heuristic score for PDF_SEO_DISPOSABLE_LINK_FARM. It contains numerous external URLs, suggesting a phishing or credential harvesting attempt. The presence of embedded URLs and the PDF structure indicate it's likely a spearphishing attachment designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://irlanc.ru/uplcv?utm_term=power+director+tanpa+watermark PDF link annotation
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/53982677150.pdfIn PDF document text
    • http://asliev.coco1490.com/upload/file_folder/file/68213224072.pdfIn PDF document text
    • https://ww150003.linebot.net/upfile/files/20210903212416.pdfIn PDF document text
    • https://adikmanis.com/contents/files/wulujedodaxetanaxa.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/4896585053.pdfIn PDF document text
    • http://tulga.ru/editor/files/40561308718.pdfIn PDF document text
    • https://robindayne.com/ckfinder/userfiles/files/84828431867.pdfIn PDF document text
    • http://www.tempshift.com/app/webroot/files/uploadimagesfile/35585319259.pdfIn PDF document text
    • https://www.albriug.com/static/editor/ckeditor/ckfinder/upfile/files/19181273520.pdfIn PDF document text
    • http://gzperson.com/uploadfile/files/91601605770.pdfIn PDF document text
    • https://okna-kursk.ru/page_edit/_samples/userfiles/files/ruxirupexotefogediw.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/dapurokatewat.pdfIn PDF document text
    • http://anninh247.info/upload/files/63285988594.pdfIn PDF document text
    • http://klimatyzacjaradom.pl/userfiles/file/tomiwasarimigapurupatati.pdfIn PDF document text
    • https://everywheregenes.com/uploadfile/qu26_qu106_com/files/gameropug.pdfIn PDF document text
    • https://netcsemege.hu/ckfinder/userfiles/files/78114486607.pdfIn PDF document text
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/kunizajaxuzejivakadafit.pdfIn PDF document text
    • https://hilanguage-com-tw.triangle-design.com/files/19608848088.pdfIn PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/25696213586.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/mufenonusototubeginowab.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7f2494784---pegumajoz.pdfIn PDF document text
    • http://blueview.nl/app/webroot/files/userfiles/files/warajibotizukozav.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_off0000e16c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF983 10640 bytes
SHA-256: 4a3a24cfada407ef5cc7147e4b5cf812f42bc54a4a4d1ea85eae534c576db328
font_02_sfnt_off000111e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E5 17208 bytes
SHA-256: 303eca1747ba3bb86786b105a5dd162612725a6819fa800dc70bbb9f47732b46

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