Malicious PDF — malware analysis report

Static analysis result for SHA-256 d23dcc80a2d49021…

MALICIOUS

PDF

75.6 KB Created: 2021-09-17 03:26:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1be86ae9b0a59963c12396f9d8f1d399 SHA-1: 81608b6eb0e0f4ad0df49ed7bf804a7e0e46ac9c SHA-256: d23dcc80a2d4902141664a97b37ed24f45599c09eb3f66a03cf3423d2e418a9a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs that point to a link farm, suggesting an attempt to redirect users to malicious content or further stages of an attack. The presence of multiple disposable hosts and UTM parameters in some URLs further supports a phishing or spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://thermcom.cz/userfiles/file/22090891930.pdf In PDF document text
    • http://srividyaastrology.com/userfiles/file/66079313383.pdfIn PDF document text
    • http://architettoannalisatinelli.it/userfiles/files/tuwabogomopewumevirosej.pdfIn PDF document text
    • https://123natura.com/stockages/files/jejixuzeveb.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/61252491784.pdfIn PDF document text
    • http://almawred-sy.com/files/adminfiles/files/58333652953.pdfIn PDF document text
    • http://niktid.ru/userfiles/file/ditixajo.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16132b74148c20---18547024515.pdfIn PDF document text
    • http://kleiberit.ru/files/file/43743017934.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416bde5857b---79574272347.pdfIn PDF document text
    • http://hawaiisushi.iorderfoods.com/uploads/files/61268478400.pdfIn PDF document text
    • http://dc-07b6a75bc4d0.breakthrough-physical-therapy.com/userfiles/files/43422989807.pdfIn PDF document text
    • http://streathamtaxi.com/survey/userfiles/files/68884323587.pdfIn PDF document text
    • http://liweisteel.co.th/ckfinder/userfiles/files/52650001116.pdfIn PDF document text
    • http://only-svet.ru/upload/files/21875903897.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/kuwokudirakokedogomoxegi.pdfIn PDF document text
    • http://timebymtm.com/upload/files/zisirenulut.pdfIn PDF document text
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/89763147083.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/donamitobagebapup.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0c904fe6d---xapalarofa.pdfIn PDF document text
    • http://vandientuchinhhang.com/upload/files/tidajexapesakuboma.pdfIn PDF document text
    • http://tinhdaurosa.com/Images_upload/files/50747613071.pdfIn PDF document text
    • http://smartvoicesys.com/userfiles/87583798039.pdfIn PDF document text
    • http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/11020761847.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/kukavububozudiziwatow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=extreme+car+simulator+hack+apkPDF 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_off0000bc59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC59 19600 bytes
SHA-256: 7b76c6ec871140daead801c8df4093ce5e10e9913873c21118567d4c9b55a19a
font_01_sfnt_off0000ef56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF56 10812 bytes
SHA-256: 0a31b9146d3bf9c9fdc5a56f43d63aee721ff8de7cf7e1ce49f8f605af5a6123
font_02_sfnt_off00010851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10851 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1