Malicious PDF — malware analysis report

Static analysis result for SHA-256 30cf9e21973d994e…

MALICIOUS

PDF

70.4 KB Created: 2021-09-29 13:01:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fb0879fd63ade0b22a773227e403863d SHA-1: 40e71fbdf6ad4fc568eeab419fe3cea8284c0ac5 SHA-256: 30cf9e21973d994e68cf09aa548d155ea8cfe578d7bfc07f8a61e1f223952de8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or distributing further malware. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://iowatriallawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nuxip.pdf In PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/wavigaxefijesifipegubil.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-9-29/20210929062241886075.pdfIn PDF document text
    • http://officegate.biz/admin/fck_upload/file/bipogitigovop.pdfIn PDF document text
    • https://solucionaesp.com/ckfinder/userfiles/files/11177513116.pdfIn PDF document text
    • https://manenshop.com/upload/files/23966090455.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/7589618810.pdfIn PDF document text
    • http://laserinnsbruck.com/static/26286373575.pdfIn PDF document text
    • http://himalayakebab.irafbrothers.com/shipinc/userfiles/files/zuwiwiwixejapulawop.pdfIn PDF document text
    • http://staceyasp.com/UserFiles/file/xuxivedumunaxujol.pdfIn PDF document text
    • http://op-gold.com/ck_image/files/lafigazigulibaliwug.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143d42d09b03---midesaxawodebabireve.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/divujewapifegidilu.pdfIn PDF document text
    • http://debrecen.varosom.hu/userfiles/files/bisosujixogomom.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/30407544494.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/23455160237.pdfIn PDF document text
    • http://greddy.com/admin/common/ckfinder/userfiles/File/71516811200.pdfIn PDF document text
    • http://maradonasalud.com.ar/ckeditor/ckfinder/userfiles/files/81644451281.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/mexumutagidugivoribigutol.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/16131fd3a111ed---fesojori.pdfIn PDF document text
    • http://yalcinsezer.com/upload/ckfinder/files/54986593530.pdfIn PDF document text
    • https://tranthachcaodanang.thicongmaiche.com/uploads/image/files/38898105098.pdfIn PDF document text
    • http://vaithun.net/upload/files/lunofok.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/gujevenezusa.pdfIn PDF document text
    • http://jeykrishnaclub.com/images/file/memupiti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=8+ball+pool+guideline+tool+pro+apkPDF 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_off0000b11a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB11A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c92c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC92C 15944 bytes
SHA-256: 96f730c47a766fa77c343f0b92840b576314be027f5e1f1b87615e6b349d4d61
font_02_sfnt_off0000f1a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A7 10840 bytes
SHA-256: 95d2ddc993ec97a1ee083e05bd4a37f2f200b39e104fb9418f1f0600b7a11929