Malicious PDF — malware analysis report

Static analysis result for SHA-256 bee8644b5e3012fd…

MALICIOUS

PDF

81.5 KB Created: 2021-09-20 01:59:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b632cb45cd7b8df3f8514eb92de75ed0 SHA-1: 5195e37eaec94acdc57813a054c628630665ab3f SHA-256: bee8644b5e3012fdea8a34523778dbc76d58dff7d15e5f9955b47c6905d89bcf
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous external links, many pointing to disposable domains, indicating a link farm or phishing lure. The heuristic PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the links and the ClamAV detection as Pdf.Phishing.Trojan point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://fujieshubao.com/zk/UploadFile/file/2021091711104273499.pdf
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/a22c93ee4caf958270a0ceb9b7066270/wolerevejubokawatazud.pdf
    • https://www.huaikrachaohospital.go.th/assets/global/lib/ckfinder/userfiles/files/todisikarukazoj.pdf
    • http://shardamedicalstore.com/singhania/downloads/file/lezamenubenuxigetonev.pdf
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/82795932183.pdf
    • https://sport-jicin.cz/dokumenty/93855733630.pdf
    • https://cplastik.com/data/cms/file/jatos.pdf
    • http://ankamet.com/userfiles/file/lepojadudise.pdf
    • http://tecs4.com/intranet/ckfinder/userfiles/files/89156622421.pdf
    • https://rosanaalvarracin.com/userfiles/file/tizedololosekizamelitupa.pdf
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/21642729506.pdf
    • http://trunglamdecor.com/uploads/userfiles/file/rerivaweritakiwewukomu.pdf
    • http://gensugroup.com/upload/files/katapodofosukukemije.pdf
    • https://2ruoteexpo.it/ckfinder/userfiles/files/54802999233.pdf
    • http://3wsystems.com/shipinc/userfiles/files/fufowimudakuvujoj.pdf
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16146f20fe9b68---jejazubafegumumufowisok.pdf
    • http://bienbao.net/uploads/files/panuba.pdf
    • http://scsytech.com/upload/files/16372777559.pdf
    • http://citygclub.com/ckupload/files/77850477920.pdf
    • http://scuderieverdina.it/scuderia/userfiles/file/64537252488.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=call+of+duty+warzone+free+cod+points
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3f4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F4 16792 bytes
font_01_sfnt_off0000ec0b.bin
f85e24d98517d080b8c576ff18d0cad9ed0ad5f0c5fc665f5e13f2387298590e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0B 11004 bytes
font_02_sfnt_off000105e3.bin
4bbf4070c4496251e7f0d4db23ab0258d34afdf2be80d642f73f31e5ba7485c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105E3 18712 bytes

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