Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7ff9cfc9feb5406…

MALICIOUS

PDF

80.3 KB Created: 2021-09-13 02:49:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4cd8b3572f194ccca909eb642fa13d8f SHA-1: c276b0b2a92d1683f84e5bc5ea1031dc2ceaa451 SHA-256: e7ff9cfc9feb54063e03a3d7352cdfa2759b978522a146ca038ab3890a1a881b
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable domains and one directly to an IP address, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URI heuristics point towards techniques used to host malicious content or redirect to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://nationalcoopadvisors.com/userfiles/files/85382985746.pdf In PDF document text
    • http://www.kroonzuivel.nl/ckfinder/userfiles/files/79047535017.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/40719111422.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/3690849942.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f0ab875b7---94385716089.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/sedenarukatexagokesewotu.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/bokuraniseludabal.pdfIn PDF document text
    • http://precisionsurgicalworks.com/alpha/ckfinder/userfiles/files/4251254662.pdfIn PDF document text
    • http://galluccifaibano.it/userfiles/file/komanisixefuzoragoxu.pdfIn PDF document text
    • https://bearings.vn/images/ckeditor/files/sofade.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/88921471046.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137613445ac6---fuvigewefofasa.pdfIn PDF document text
    • https://ckeditor.pamlskovnik.cz/ckfinder/userfiles/files/tarami.pdfIn PDF document text
    • http://obkladlazby.cz/userfiles/file/ruvezu.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/6893255098.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/lopexezizagugawunojoxo.pdfPDF link annotation
    • http://micdelhi.in/userfiles/file/rukipukukama.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/40116093084.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/vexegabafefeletil.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/37630230148.pdfIn PDF document text
    • https://emenu.hu/editor_up/zoxafikapeparupeka.pdfIn PDF document text
    • http://thaoduocvn.com/userfiles/image/file/61292529706.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/55615367929.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+block+internet+calls+on+androidPDF 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_off0000d6fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6FE 16684 bytes
SHA-256: 96a3facb4bc86eef97384489b79f0d9d958291e6faa77c8a03f7db55c6f03848
font_01_sfnt_off00010246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10246 10672 bytes
SHA-256: 7dfa21f3b6d620ce2823b136412e1af58ee0d6a3ad1b89948386c55c84f1bbcc
font_02_sfnt_off00011ae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1