Malicious PDF — malware analysis report

Static analysis result for SHA-256 57986d382a8a809d…

MALICIOUS

PDF

83.5 KB Created: 2021-09-13 05:55:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: dd8cb0bdf14fbe310b264fb089d4288f SHA-1: eb0840033e74f68007b17db748397aad571fbe88 SHA-256: 57986d382a8a809d65db3ffa8b11d52b96fff45870cf6f7ae11adb58040b8b65
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It functions as a link farm, hosting numerous URLs that redirect to software download sites, specifically mentioning 'autocad 2016 keygen download'. The document's structure and embedded URIs suggest an attempt to trick users into downloading and executing potentially harmful software. No scripts were extracted, but the PDF's nature as a link farm points towards a phishing or malware distribution vector.

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 https://philabc.ru/uplcv?utm_term=autocad+2016+keygen+x64+download PDF link annotation
    • https://krusomying.com/data/file/revifixubodorafaf.pdfIn PDF document text
    • https://techielingo.com/fck_uploads/files/rojamawifuxajexujafiw.pdfIn PDF document text
    • http://studiotecnicoprato.eu/userfiles/files/ratobugogeregomozebeseguj.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/lutexugabusivebotuli.pdfIn PDF document text
    • https://losungversorger.com/product/file/sowugotabi.pdfIn PDF document text
    • http://mamnonhieutrung.edu.vn/ckfinder/userfiles/files/lulijuvib.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302fc475148---34168995657.pdfIn PDF document text
    • http://yjeverspeed.com/userfiles/file/67958477102.pdfIn PDF document text
    • https://on-call-anatomist.org/ckfinder/userfiles/files/jegijosetijupesibop.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/3062583728.pdfIn PDF document text
    • http://hig-hegmann.de/userfiles/file/ruzuzanizuromekazoga.pdfIn PDF document text
    • https://anitt.in/ckfinder/userfiles/files/54741448836.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/20847664731.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/boledivusoreza.pdfIn PDF document text
    • http://100gastro.cz/soubory/files/zugipudemisuxibusopekope.pdfIn PDF document text
    • https://taucaotoccatba.vn/images/news/files/bazenoga.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/30610178068.pdfIn PDF document text
    • http://utpcomp.ru/uploads/files/wiruveguxudi.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/nanetilufijokugepebek.pdfIn PDF document text
    • https://trouver-une-ssii.com/img/pics/files/54396692673.pdfIn PDF document text
    • https://albizy.com/ckfinder/userfiles/files/wofovovewanagilapabepuju.pdfIn PDF document text
    • https://afma.pt/site/upload/file/fudujusexarop.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/rimizavedigoxubonomakog.pdfIn PDF document text
    • http://infinity8talents.com/userfiles/file/90140662037.pdfIn PDF document text
    • http://darec.sk/files/files/kitofejaxozujikivewametij.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_off0000dbfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f40c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40C 18856 bytes
SHA-256: 3ca6d8f842173c2b82f68bbe204a6ffe05cbf35ed5cd8a408c3ef6490f0ad856
font_02_sfnt_off00012585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12585 11200 bytes
SHA-256: 862b9b324301bcc688000e2e13ac01db44642ef24cee4febb31a977a8e893033