Malicious PDF — malware analysis report

Static analysis result for SHA-256 615ce320bf42b490…

MALICIOUS

PDF

80.0 KB Created: 2021-09-15 03:06:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f049227e95956f312a95e564fd995279 SHA-1: b144896cb55ba8b04f0236f7485ee0898648f5e0 SHA-256: 615ce320bf42b490813fdedc5dade0ed7fe04d23e2d45231514806d72c30903f
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 high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links, likely to distribute further malicious content or phish users. While no scripts were explicitly extracted, the nature of the embedded URLs and the overall detection points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://sharon-barron.com/userfiles/files/56395382813.pdf In PDF document text
    • http://deforma.it/userfiles/files/87760796767.pdfIn PDF document text
    • http://support-cmu.com/filedata/file/didimivoruzorajifatiso.pdfIn PDF document text
    • http://music-summer-courses.eu/upload/files/20997470750.pdfIn PDF document text
    • http://thinhhoanggia.vn/Images_upload/files/63491593853.pdfIn PDF document text
    • http://kcemsp.org/upload/editor/file/9346495288.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/161326410a9cc1---rinemekosevusezafuvol.pdfIn PDF document text
    • http://maurovalleferroarchitetto.eu/userfiles/files/20091029396.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/67773330357.pdfIn PDF document text
    • http://flexa.cz/docs/file/87952342143.pdfIn PDF document text
    • http://alacarte-husum.de/userfiles/file/vujazavenovupobepuk.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021091409354673499.pdfIn PDF document text
    • http://thanglong.vn-greenenergy.com/ckfinder/userfiles/files/16504150101.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/73600661085.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/17103126761.pdfIn PDF document text
    • http://stillincontact.com/images/mails/file/17087695596.pdfIn PDF document text
    • http://dycelife.com/userfiles/file/tujesapinotobisekakore.pdfIn PDF document text
    • http://domgr11.ru/uploads/files/50474132942.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/8005198542.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614134039a9a8---29596801786.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/96899677307.pdfIn PDF document text
    • https://h1t-url12shio-turbo.com/contents/files/wopuvotivedimu.pdfIn PDF document text
    • http://tootingtaxi.com/survey/userfiles/files/67676818390.pdfIn PDF document text
    • http://sitarofindiamd.com/userfiles/file/3708906078.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=informatica+basica+pdf+libroPDF 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_off0000d5c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C6 17392 bytes
SHA-256: b1ff3d1d61032c4cd90fdcd602f734d371fecec3a3140cfe64abfc6da3ff680d
font_01_sfnt_off0001020c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1020C 10740 bytes
SHA-256: c51bc969afa9277708fd62810ce622578382ae9d868ba53006755a5b3488a4ee
font_02_sfnt_off00011a7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1