Malicious PDF — malware analysis report

Static analysis result for SHA-256 e853d4183412e733…

MALICIOUS

PDF

69.2 KB Created: 2021-09-26 01:20:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f0ccf12e19d45df7323cb389c119ea01 SHA-1: f443995ea3c18b65d1192317d7b220421cca8849 SHA-256: e853d4183412e733fb46ae480b0045b7d56a739553744d904c0f7b66d90b1cd4
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as an image-only lure, typical of phishing campaigns, designed to trick users into clicking an embedded link. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of distinct, potentially disposable hosts, suggesting a broad phishing effort. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's a delivery mechanism for malicious content, likely leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 69 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.
  • 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://cheumst.com/upload/fckeditor/file/tajexuxujexexobavazipeg.pdf In PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/f4749011dcd77e87f0c0f08f1a0723ea/16097894196.pdfIn PDF document text
    • https://ltes2.tw-goods.com/UserFiles/files/mobofotevobamoxalukozuwa.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/5900421359.pdfIn PDF document text
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/fazeguluvuvatemesamajona.pdfIn PDF document text
    • http://xn----otbbfbbknchz.xn--p1ai/sadm_files/80525090193.pdfIn PDF document text
    • http://frankifoto.com/uploads/pages/files/37122876634.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/91618583955.pdfIn PDF document text
    • http://ekstelekom.com/userfiles/file/virin.pdfIn PDF document text
    • http://goodmax.ru/i/files/22799922455.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/40641649962.pdfIn PDF document text
    • http://miyagi.chi-kara.net/Upload/files/4966951351.pdfIn PDF document text
    • http://ccadl.com/files/20210906040053.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/kavafikemadux.pdfIn PDF document text
    • http://cu-hinothai.com/ckfinder/userfiles/files/39958405391.pdfIn PDF document text
    • http://islandpointfl.com/userimages/basudeziwolomupudomiko.pdfIn PDF document text
    • https://vroa.pl/chplusfiles/file/wurafujevesugo.pdfIn PDF document text
    • http://matrix-corporation.com/upfiles/editor/files/12723512350.pdfIn PDF document text
    • https://035620126.tw/upload/greenkitchen/files/tuxawijuwirasevuxotolix.pdfIn PDF document text
    • http://faizleathergloves.com/userfiles/files/vukokafo.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/7m5cdu5h5q2b7m92g30lbgcj2g/zokajikabegevax.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/11122000339.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/wojojikifojoviba.pdfIn PDF document text
    • https://jagominum.com/contents/files/15179474376.pdfIn PDF document text
    • http://besttailor.info/ckfinder/userfiles/files/36562368542.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=temple+run+3+game+download+mobile9PDF 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_off0000b25f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB25F 11096 bytes
SHA-256: bb33b6e7c84b07e1c56c1d4f6c9c83cac1e3200d584e984e63be024aa4fd04e6
font_01_sfnt_off0000cbc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC0 14164 bytes
SHA-256: 3eda13de1ac15b007468fca84c0b6ec9ff08e8a23b529b3d211c66e1696d8d39
font_02_sfnt_off0000ef03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1