Malicious PDF — malware analysis report

Static analysis result for SHA-256 0783a77d2f491835…

MALICIOUS

PDF

80.2 KB Created: 2021-09-20 19:15:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1c2c4900b7b42183cd414c2d0bb94a04 SHA-1: be1f78ef6ab4f316762bf7ce1220ede7320d7800 SHA-256: 0783a77d2f491835713a60532b27c1bce3fdc0337c85488261fbdbca5df7f419
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and form a link farm, a common tactic for phishing or malware distribution. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a large number of distinct hosts and links within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/a20e359386d7f69be89ef6beddbb5c2e/38645237924.pdf In PDF document text
    • http://douzonebnf.com/upload/file///junigitinakipaxudezurila.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/ramepav.pdfIn PDF document text
    • http://veewood.com/file_media/file_image/file/63651064834.pdfIn PDF document text
    • https://ice-group.pl/userfiles/file/susasokovuxibo.pdfIn PDF document text
    • http://magyaringatlanadatbazis.hu/dev/_user/file/lutilubuxagozewadox.pdfIn PDF document text
    • http://www.taimaobi.com/admin/ckfinder/userfiles/files/88971415465.pdfIn PDF document text
    • http://watch62.ru/files/files/4075878621.pdfIn PDF document text
    • https://thepainter.asia/upload/files/15262351770.pdfIn PDF document text
    • http://progetec.org/userfiles/files/pisolamirudogel.pdfIn PDF document text
    • https://dnm.tw/uploads/files/202109111225096156.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1b6a7eebd---vojasavopibi.pdfIn PDF document text
    • http://spzpoz-zdunskawola.pl/upload/file/wojimito.pdfIn PDF document text
    • http://www.gobarging.com/uploads/textareas/file/38093669520.pdfIn PDF document text
    • https://izyskately.ru/foto/ck/files/93448368441.pdfIn PDF document text
    • https://nstyapi.com/resimler/files/59959261247.pdfIn PDF document text
    • http://sperrincaravans.com/images/file/94825660973.pdfIn PDF document text
    • http://odra.cycling-recycling.eu/imgturysta/files/betovogijejupekuga.pdfIn PDF document text
    • https://telechips.com/ckfinder/userfiles/files/71354636340.pdfIn PDF document text
    • http://tnslib.su/userfiles/files/wirifebadigepigakowunu.pdfIn PDF document text
    • http://ville-dammarie.com/ckfinder/userfiles/files/9198435335.pdfIn PDF document text
    • https://unitedfightalliance.com/ckfinder/userfiles/files/viwodud.pdfIn PDF document text
    • http://xatrbio.com/userfiles/file/rogisakijevukax.pdfIn PDF document text
    • https://hanomanberjaya.com/contents/files/95261613531.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/22339216722.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=how+to+put+imessage+games+on+your+phonePDF 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_off0000d5c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD9 10944 bytes
SHA-256: a7efc445194bea2914fadca65cd3f2428ab728f43d1ad2515cf96e139e6ee2e5
font_02_sfnt_off0001071d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1071D 17124 bytes
SHA-256: a1c6b29ac1a9e64d7b331bbaa3ee7c83119b9f95f5a33617fc5c2021848bd7b7