Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8b66b5bc51bd8b2…

MALICIOUS

PDF

84.8 KB Created: 2021-09-17 12:50:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 4012aa9ba29e44658bddcaeeb52890dd SHA-1: 8f2bfd50366d6fec776d236abe319ce7c839fd8d SHA-256: d8b66b5bc51bd8b2dafa167eeb6f3b018b33d53862d0db6aae98522e5fef6d08
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many pointing to disposable domains, and a heuristic identified it as a link farm designed to obscure the true destination. The presence of a 'download' button lure further supports a malicious intent to trick users into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://xn--z4qq44i.xn--kpry57d/upload/actfiles/65549864347.pdf In PDF document text
    • http://ohxto.com/uploaded_files/userfiles/files/2635205983.pdfIn PDF document text
    • https://dm288.com/slicice/file/fowedonorinoguwozen.pdfIn PDF document text
    • https://robertbah.si/files/file/vumarixipeduzanumofepumug.pdfIn PDF document text
    • http://huichem.com/ckfinder/userfiles/files/soromupizone.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/28354823843.pdfIn PDF document text
    • http://gro-felix.si/uploads/81860854279.pdfIn PDF document text
    • http://votava2.altrodesign.eu/ckfinder/userfiles/files/74244464745.pdfIn PDF document text
    • http://cuacuonductudong.com/upload/files/73122591661.pdfIn PDF document text
    • https://barrier.exma.cl/ckfinder/userfiles/files/tewuroxuguletagotop.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/xuwipiwaxi.pdfIn PDF document text
    • http://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/14519723876.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/xusun.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/99329558661.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/13123689125.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/lodujevapu.pdfIn PDF document text
    • https://ubranni.com/uploader/files/vopiguren.pdfIn PDF document text
    • http://full814.com/upload/files/runekiba.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/mivozepev.pdfIn PDF document text
    • http://dongbanja.com/userData/ebizro_board/file/34155609894.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/57410007071.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/28778640669.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/1631937400.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=organic+chemistry+multistep+synthesis+practice+problems+with+answers+pdfPDF 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_off0000e3c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C0 11532 bytes
SHA-256: 2c78ab3386c1e5c82495ce50ae6b42396c0debf985d78acfbdafc19d40ba64e1
font_01_sfnt_off0000fe9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116AC 17572 bytes
SHA-256: a9e293525ac10a242d1b2a8dbbe864f9374af8f10e3baf59826ff3dc8320db8e

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