Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fd39f1930ce306d…

MALICIOUS

PDF

68.2 KB Created: 2021-09-12 17:03:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 5db53ee9f104b4965a8874e72a83e283 SHA-1: 5f9766fc959f90319959da853311849303bb0743 SHA-256: 9fd39f1930ce306d655a5daaaa1d7be6f20487fb535541eb6b5725b2f94c8659
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ML classifiers and ClamAV. It employs a common phishing lure technique, presenting itself as an image-only document to conceal clickable links. The embedded JavaScript and numerous external links, many hosted on disposable domains, suggest an intent to redirect users to malicious sites for credential harvesting or further payload delivery. The presence of embedded JavaScript indicates potential for executing malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://raczcsalad.hu/files/36311315073.pdf In PDF document text
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/76980806790.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210908185558.pdfIn PDF document text
    • http://avtokit116.ru/!upload/files/88026740113.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4cf6beac01413ac51723745c4b982870/43903733557.pdfIn PDF document text
    • http://enslev-anlaegsservice.dk/userfiles/file/rupedileridu.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/xomatewofawatog.pdfIn PDF document text
    • http://rem-proekt.com/f/file/99587421506.pdfIn PDF document text
    • https://currenwatch.myhost360.cn/file/upload/files/09-12-03-34-25-79.pdfIn PDF document text
    • http://yibetter.com/data/files/vomaso.pdfIn PDF document text
    • https://aathichudi.org/userfiles/file/mevasuvavu.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161327ff19e362---semosoviwopamip.pdfIn PDF document text
    • http://dulwichtaxi.com/survey/userfiles/files/zovoxosanuwigutumuvamux.pdfIn PDF document text
    • https://qian-ho.com/upfiles/editor/files/75094308586.pdfIn PDF document text
    • https://vietrocknet.org/app/webroot/img/files/tilonibadapusufipalo.pdfIn PDF document text
    • http://maxbrio.kr/files/files/dajiw.pdfIn PDF document text
    • http://re-media.ru/foto/ck/files/59860466324.pdfIn PDF document text
    • http://sk4education.com/ckfinder/userfiles/files/manokojomotepe.pdfIn PDF document text
    • http://santiagoporter.com/js/ckfinder/core/connector/php/files/tidevakafajuvabozez.pdfIn PDF document text
    • https://superpart.com/files/kazojujabijadov.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/52242320795.pdfIn PDF document text
    • http://aurora-c.jp/files/files/39554701183.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-8/20210908135629533431.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+download+emulator+for+androidPDF 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_off0000b037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB037 14060 bytes
SHA-256: ec2f6933bc1fa6e5c274ced71403877874019da4b29e787abe6cb8de076c276b
font_01_sfnt_off0000d324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD324 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3B 10524 bytes
SHA-256: c8ed250066e9053e0a7012beacfd031aad7dfadf135ccb78f18d7fc8b1208a28

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