Malicious PDF — malware analysis report

Static analysis result for SHA-256 796eb7a0e7b1b14b…

MALICIOUS

PDF

72.3 KB Created: 2021-09-13 16:57:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a967d8b85c774788b8e2d260f1df0978 SHA-1: 34ac32f3a7ecc93ef7e0017a4992356547bfc43a SHA-256: 796eb7a0e7b1b14b95e3ef0e6eb98b6c4400ec51339c5d502f99c0c7b8b2ca00
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://daimarconstrucciones.com/images/admin/file/31133741373.pdf In PDF document text
    • http://www.kevimotor-rock.hu/files/files/wurur.pdfIn PDF document text
    • https://lengthening-sldf.com/userfiles/file/xabarugufi.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/wafinorezitexadabirarut.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/9188684fbdfc9d8f107d19e7a9d5dd3b/29772364668.pdfIn PDF document text
    • http://abwbaltimore.com/uploads/files/61729023762.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/medap.pdfIn PDF document text
    • http://hoangminhsaigon.vn/@dmin/js/ckfinder/userfiles/files/80601029713.pdfIn PDF document text
    • https://sma-dfgg.org/site/admin/file/42238498079.pdfIn PDF document text
    • http://fcvperu.org/data/fcvperu/userfiles/file/pekomatobadegomevarumufow.pdfIn PDF document text
    • https://globalcircle.club/userfiles/file/25132498205.pdfIn PDF document text
    • https://fetogram.com/images/upload/files/25061399409.pdfIn PDF document text
    • http://fuerst-architects.com/uploads/file/17465276195.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/gogufamotadajesoguje.pdfIn PDF document text
    • http://hybsch.it/upload/file/vunufilamiriweguxanax.pdfIn PDF document text
    • http://cadelupo.it/userfiles/files/nifoj.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///2171330090.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/8832079757.pdfIn PDF document text
    • http://mikailang.com/userfiles/file/20210909065957_2070884096.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/56417181573.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/58195232437.pdfIn PDF document text
    • http://rld-carbon.ru/file/66483707476.pdfIn PDF document text
    • http://klaaswester.nl/img/file/taxebasujoro.pdfIn PDF document text
    • http://eros-arena.com/eros/userfiles/file/66225478513.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=candy+charming+2019+mod+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_off0000b371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB371 17940 bytes
SHA-256: d4769b44f08b56afc662a45d408c98178a63684791e9b26a3c48b632a25c1f85
font_01_sfnt_off0000dfea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEA 11216 bytes
SHA-256: 06bae20af1cbf36cc7aedbdade5c676a731a06a482f5c0fe818a6d682aa873f3
font_02_sfnt_off0000f9d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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