Malicious PDF — malware analysis report

Static analysis result for SHA-256 23889f705862870d…

MALICIOUS

PDF

72.0 KB Created: 2021-09-28 15:35:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dafbcc5c9ba294450ad5808f87fd04c9 SHA-1: 220c311c8c6bf4137fda9c5ddba478595532f7f4 SHA-256: 23889f705862870dd853432b5a742b7124c1db32cdbf39a23d05feb023036874
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded links, with a high-confidence heuristic identifying a link farm on disposable hosting designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://crysiq.ru/uplcv?utm_term=kgf+kannada+full+movie+online+watch+tamilrockers
    • https://delphin-restaurant.com/ckfinder/upload/files/fejedoko.pdf
    • http://lucidareemantenerepavimentifaidate.it/userfiles/files/30403094186.pdf
    • https://pharmawell.eu/ckfinder/userfiles/files/98978127677.pdf
    • http://kozelsk-adm.ru/files/uploads/files/wemolapukedaposotiwok.pdf
    • http://ebara.com.hk/ckfinder/Zenith/userfiles/files/97321186533.pdf
    • https://ferdavagnar.is/images/fck/file/kuluvivoseno.pdf
    • https://www.bnbtravels.com/ckfinder/userfiles/files/kuvoxirijefufuzokuro.pdf
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/8d76cd7f4e989a31772237e3596636ce/newuxonuji.pdf
    • http://thewhitmerlawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/33472540950.pdf
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/24817906859.pdf
    • http://studioaeditecne.it/userfiles/file/25982281701.pdf
    • http://musthighschool.mn/ckfinder/userfiles/files/62740432680.pdf
    • https://sapporomn.com/userfiles/files/14999529305.pdf
    • http://tsraccountants.nl/mailing/images/photo/file/bupilurujawogi.pdf
    • http://enslev-anlaegsservice.dk/userfiles/file/24001848718.pdf
    • https://0955205219.jwa.tw/userfiles/files/71004134347.pdf
    • http://bladensburg.abwingsmd.com/uploads/files/30394185571.pdf
    • https://chiataiec.com/userfiles/Proj_Name/files/14437300221.pdf
    • https://birudongker.com/contents/files/2121926796.pdf
    • http://czechdidgeridoo.com/admin/upload/file/jukonosulepaxozub.pdf
    • http://xn--2o2b17g32e8xisqq.com/userData/board/file/nelifaxigejemupovuvujegi.pdf
    • http://luchetti.it/userfiles/files/mivasuruziseniwilik.pdf
    • http://frankifoto.com/uploads/pages/files/nokujusewufowijurodesukop.pdf
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nodoledoromokegute.pdf
    • http://icbiz.ru/userfiles/file/zosutoku.pdf
    • https://aedwea.com/upload/foto/vawosimu.pdf
    • 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_off0000b2ba.bin
6f72dc29be38ccb6ac0deaeb3ffa9150c22ed91172c66e661379509b75639445
pdf-font-stream PDF embedded font (sfnt) at offset 0xB2BA 11260 bytes
font_01_sfnt_off0000ccca.bin
108ea61a108ed63e7cf6a3f11a1a1d36dbf52111dab131158738b79924481dee
pdf-font-stream PDF embedded font (sfnt) at offset 0xCCCA 17040 bytes
font_02_sfnt_off0000f855.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF855 16792 bytes