Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ed4d7b86805b761…

MALICIOUS

PDF

83.6 KB Created: 2021-09-10 14:52:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c75a58b146c0e1a590f0a9939f6c1c30 SHA-1: 1b6eaa09f1d8e407b61de9c7b2f1f3a920a44638 SHA-256: 9ed4d7b86805b761d177d9c49b061adb3dc7c52ca4e7878a0ecdf0c8bf24b7d2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs pointing to a link farm, indicating a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, noting the use of disposable hosting and redirectors.

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://tadimtursu.com/image/files/kilesajudesuvajabuvarize.pdf In PDF document text
    • http://mail-business.ru/uploads/file/51095657306.pdfIn PDF document text
    • http://majedalkarkhi.com/pics/file/tujulofifobego.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/93145177827.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/55374154821.pdfIn PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/24443549025.pdfIn PDF document text
    • http://quangcongluc.com/upload/files/4946064961.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/rolefojulizepijodegebupe.pdfIn PDF document text
    • https://gabconstruction.com/ckfinder/userfiles/files/bifugu.pdfIn PDF document text
    • http://www.77ice.com/upload/files/feludo.pdfIn PDF document text
    • https://casasholidays.com/scgtest/team-explore/uploads/files/najexinovapawemedoloki.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/161377fe635b00---debenikap.pdfIn PDF document text
    • http://universalthailand.com/images/uploads/ckfinder/files/sejeda.pdfIn PDF document text
    • https://whatshoulditcostme.com/userfiles/file/64817874395.pdfIn PDF document text
    • http://vhshf.de/File/12014652519.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/fumat.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab003c8e65---sukomusuguvafaworowikiv.pdfIn PDF document text
    • http://polyacer-ecp.com/userfiles/files/20210901_060537.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021091019500873499.pdfIn PDF document text
    • http://trivio.it/userfiles/files/jegawugoziwozop.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/dunawazepajoj.pdfIn PDF document text
    • https://adetexfoamgroup.centralcms.cloud/galeria/files/tijijenubiwuwewobex.pdfIn PDF document text
    • https://beytarimcilik.com/admin/editor_resim/file/zilokimolikoxibiwofug.pdfIn PDF document text
    • https://www.colline-eternelle.com/ckfinder/userfiles/files/57728966957.pdfIn PDF document text
    • https://newtop-eg.com/userfiles/file/4064446965.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=download+fb+lite+3PDF 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_off0000e061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE061 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF873 18540 bytes
SHA-256: ab75c161e30803638ef3759679db08e25ac67143519cf7d13bb47a5c77e3c439
font_02_sfnt_off0001287c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1287C 10476 bytes
SHA-256: 561a7cf65e5259c6c64b46205ab685303984fc8763df18be9b4db23fa6e45678