Malicious PDF — malware analysis report

Static analysis result for SHA-256 a84df35f554b3b53…

MALICIOUS

PDF

68.7 KB Created: 2021-09-28 09:33:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 064e9b616e889fcd0f1a8c1ed10e38c5 SHA-1: 20dd9aaa9ff0777c8021d2323b0a74147b861789 SHA-256: a84df35f554b3b53b48000ef1932f23b304dc1ea2f625c38833730bb52fac00c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is flagged as a phishing lure by heuristics, indicating it's designed to trick users. The document body is heavily obfuscated, but the presence of external URIs and the ML classifier's high confidence score suggest it likely leads to a malicious site or payload. The embedded JavaScript is likely used to facilitate the malicious action, such as redirecting the user or downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://pistant.ru/uplcv?utm_term=descargar+metronomo+para+android PDF link annotation
    • http://haihengpharm.com/upload/files/labuje.pdfIn PDF document text
    • http://bayernglobal.de/userVZ/file/ranorawowosujufadamuxek.pdfIn PDF document text
    • http://rintoyo.com/userfiles/file/minalirino.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/godepisewube.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/ziloxelobisigilagusu.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/4aa8314b63a13e7a32800db9c6e79f9e/fewuwisegikefud.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/59666094134.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/rosazab.pdfIn PDF document text
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/kiganemuf.pdfIn PDF document text
    • http://intimatehotelpattaya.com/image/upload/File/farugufituteza.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///voxuni.pdfIn PDF document text
    • https://diphong.com/uploads/21334261418.pdfIn PDF document text
    • https://www.asoriofrio.org/ckfinder/userfiles/files/vugulokiwo.pdfIn PDF document text
    • http://bachtungcompany.com/upload/files/71754352576.pdfIn PDF document text
    • http://designklasse.de/ckfinder/userfiles/files/36985519013.pdfIn PDF document text
    • http://zimmerei-possert.at/57164879680.pdfIn PDF document text
    • http://jvcc.cn/ckfinder/userfiles/files/210925234859982949fksrd.pdfIn PDF document text
    • http://fitviewer.biz/files/file/72149117486.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/161525918521ff---dixoz.pdfIn PDF document text
    • http://abwlondonblvd.com/uploads/files/zajijomisemexijivoxu.pdfIn PDF document text
    • http://qlionshousing.ca/userfiles/file/47065423562.pdfIn PDF document text
    • https://get-insurance.in/ckfinder/userfiles/files/97052545110.pdfIn PDF document text
    • http://tnslib.tools/userfiles/files/mopojabulitidugigurov.pdfIn PDF document text
    • https://ikansambel.com/contents/files/dolokelagebusegebeb.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/wudunexemuzawominosat.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_off0000afe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFE0 10812 bytes
SHA-256: bd2d24ded903c13030b361a80a70519d5795d745482dc8ca56aee3501ea4d868
font_01_sfnt_off0000c89c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC89C 14548 bytes
SHA-256: ecee487f9005351fd9a346834097aa5e14b2487542f02b80b6a433a8726b923b
font_02_sfnt_off0000ed10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1