Malicious PDF — malware analysis report

Static analysis result for SHA-256 0649998df62de651…

MALICIOUS

PDF

81.1 KB Created: 2021-09-14 12:44:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 7ad10ac75b4aee19131ee28548de6b38 SHA-1: de96d85e2a63d92d6cd2004d997d53e757b79c35 SHA-256: 0649998df62de651fabdf2128192e2862a50dc9a31a30cc0cc242ea230ee5fa0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a social engineering attack designed to trick users into downloading malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dogomanhnghia.com/uploads/files/50719584024.pdf In PDF document text
    • http://intertexmedical.com/userfiles/files/potonufalamor.pdfIn PDF document text
    • http://valencia.thepokeluau.com/uploads/files/93894887566.pdfIn PDF document text
    • http://whatifitspossible.com/ckfinder/userfiles/files/26789839685.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/nenajajefev.pdfIn PDF document text
    • http://lehnerkom.de/images/uploaded/file/7123224364.pdfIn PDF document text
    • https://unaizahic.com/Files/files/pitemideradexol.pdfIn PDF document text
    • http://garankuccu.com/upload/fckimagesfile/3893e49152cb3c627b068c2394120dfa.pdfIn PDF document text
    • https://sgcaregiver.org/contents/files/kaludisoze.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/toramonulirarakutego.pdfIn PDF document text
    • https://casaalu.com/luutru/files/gilefotamofuniti.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/luwuwufagukivaraliluzer.pdfIn PDF document text
    • http://afslab.asia/upload/files/45529771570.pdfIn PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/ruposi.pdfIn PDF document text
    • https://madame-tina.com/ckfinder/userfiles/files/27991400555.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-11/20210911040544668853.pdfIn PDF document text
    • http://sipsak.nl/userfiles/file/dibexikeribimesunuw.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/sotitinaretegapu.pdfIn PDF document text
    • http://torby.kbo.pl/ckfinder/userfiles/files/jetenobu.pdfIn PDF document text
    • http://vinhosnorte.com/images/files/xoresidakuzu.pdfIn PDF document text
    • https://sarenpinler.com/calisma2/files/uploads/348010220.pdfIn PDF document text
    • http://tao-ssct.org/data/upload/file/85131080382.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/71977466738.pdfIn PDF document text
    • https://menu2uplus.com/images/file/kibopajuvid.pdfIn PDF document text
    • https://indiansabroad.uk/userfiles/file/88769796352.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=apk+lightroom+downloadPDF 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_off0000da7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF295 10696 bytes
SHA-256: 5930003c9d9b6d8cc75c94de51861315f472ee720188f4dd605ebfcfa7c7e90d
font_02_sfnt_off00010abc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABC 17040 bytes
SHA-256: 6ca344ba89761894c3314348dac2085aa8a07530766449d27ef8288ad0f39894