Malicious PDF — malware analysis report

Static analysis result for SHA-256 847e9eff9d5d08b9…

MALICIOUS

PDF

73.7 KB Created: 2021-09-25 17:16:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b74cc51b4142fd17378f2eb3e927bf5d SHA-1: 820d2fd3145383da7736f7ee6605e90f1b781c41 SHA-256: 847e9eff9d5d08b940eb5f55ea2c15f520257568da0e3aa921b8184ecb79dba6
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains multiple external URIs, including one pointing to a raw IP address, indicating redirection to potentially malicious sites. The PDF structure and numerous links suggest it's part of a link farm designed to obscure the final destination, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613182ee25084---kupulaxevopedutaniwesipe.pdf In PDF document text
    • https://kampusogrenciyurdu.com/file/kenilil.pdfIn PDF document text
    • https://csam-villepinte.org/uploads/images/file/16053345425.pdfIn PDF document text
    • http://1544-7419.net/upload/fckeditor/file/wenetavufomewusawedepumoj.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/sebiti.pdfIn PDF document text
    • http://progettogeometra.it/userfiles/files/61649049523.pdfIn PDF document text
    • https://eldorado777.ro/upload/editor/file/fekanixotuzobufodu.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/96513182407.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/tipen.pdfIn PDF document text
    • http://medianet2000.net/amm_prod/image_news_popup/file/35416705408.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/96361806592.pdfIn PDF document text
    • http://140.121.180.103/ckfinder/userfiles/files/zipexumuza.pdfPDF link annotation
    • http://arunimaflavours.com/userfiles/file/wudoravava.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/fisokulobeninemilizuxuzom.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/c5eca15cb38236cac50109153128f018/sonexe.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/mufodovodewabojubelupa.pdfIn PDF document text
    • http://motopujcovnateplice.cz/userfiles/file/senajapibinigerovedizosu.pdfIn PDF document text
    • http://www.gulbaharsigorta.com/contentData/file/puzuxuw.pdfIn PDF document text
    • https://wendi101.com/userfiles/file/53215238365.pdfIn PDF document text
    • http://ibb-online.ru/f/file/sepanomo.pdfIn PDF document text
    • https://mailing.crpm.ch/ck/ckfinder/userfiles/files/13023028413.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/81719373414.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/98633654823.pdfIn PDF document text
    • http://ruihuitax.com/files/file/54918517786.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/161464d8253bfc---petiropavawidikutusozuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=x+browser+miniPDF 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_off0000ba9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d2b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B1 10196 bytes
SHA-256: 5fe0e6521fd638a0a4c21b4b83a55a4386a2800f0810a3b234ec4af6e76e34a1
font_02_sfnt_off0000e993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE993 18640 bytes
SHA-256: 991e0d2fa1962efc16eb24c83e171a07f469c045d2f128bd7efdddda0036309c