Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcbcad6efc27ae31…

MALICIOUS

PDF

84.8 KB Created: 2021-09-13 22:54:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 82f2ace1314cb0cad838fcac3b5875d2 SHA-1: 575dee3090cb4f10cfd8d8343d4e8eacb36b5991 SHA-256: dcbcad6efc27ae31243fd3b807ce675b32dccf4c6cc8249fb5e3c7f49a320f97
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains a link farm with numerous URLs hosted on disposable domains, designed to redirect users to download files. The presence of embedded URLs and the link farm structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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.
  • 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://www.rpv-drachten.nl/files/file/xisedaxiwuxakepuvezesuf.pdf In PDF document text
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210902_4491A7EE21118641.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/27866843318.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/21709103501.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/53584504783.pdfIn PDF document text
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/61134373324.pdfIn PDF document text
    • http://jnejendomsdrift.dk/userfiles/file/53158812784.pdfIn PDF document text
    • http://0975811252cool.linker.tw/files/podozatoxipuniloba.pdfIn PDF document text
    • http://internet-trade.eu/UserFiles/file/mijazu.pdfIn PDF document text
    • https://sananselmo.com/wysiwygfiles/file/28134862660.pdfIn PDF document text
    • https://5of7edwardstreet.com/assets/media/files/78771401184.pdfIn PDF document text
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/2021931256496899.pdfIn PDF document text
    • https://renetravel.ro/images/files/65812309107.pdfIn PDF document text
    • http://mcap.cz/images/uploadedimages/file/66534618392.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/fajuvumas.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/2143025591613a7b1657417.pdfIn PDF document text
    • https://salonrewards.ca/images/file/tulidobebenozesovojo.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/siligukumumibenemiw.pdfIn PDF document text
    • http://wuyioutdoor.com/userfiles/file/36417114664.pdfIn PDF document text
    • http://1666-3668.com/attach/userfiles/file/95033851221.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/fesifimeti.pdfIn PDF document text
    • http://jlm-kg.com/uploads/file/39936288318.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/negixunumuron.pdfIn PDF document text
    • https://crc.creativechange.net/ckfinder/userfiles/files/25959261726.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/811117657.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=pokemon+randomizer+rom+gba+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_off0000e560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE560 18372 bytes
SHA-256: 7b4c53687145a919276a8d32c79f4394879ca43eae064065aae0d909cfc0b8ac
font_01_sfnt_off00011521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11521 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D38 10572 bytes
SHA-256: bbe093f319cf2e0aa58c1706697efb644e69bb58ebe0708185d0c824903c76ed

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