Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fcaffeb7d46153f…

MALICIOUS

PDF

79.4 KB Created: 2021-09-22 18:19:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 84231765e4a7ef3aeafb935992740102 SHA-1: eb1205b856d55cb539cbbce31b8d956db30a60f6 SHA-256: 3fcaffeb7d46153f0ecbafd2ac325b868ca96e4ee1f22ef4ef2eabd8a03d0246
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and is identified as a link farm hosted on disposable domains, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and the presence of external links are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crewmak.ru/uplcv?utm_term=class+12+physics+basic+formulas PDF link annotation
    • http://derp74.fooden.com/UserFiles/files/43370042210.pdfIn PDF document text
    • https://tmtteks.com/files/zavefalaxewofumajezefi.pdfIn PDF document text
    • http://gzmzwl.com/Uploadfiles/files/murum.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/lofodelonexasij.pdfIn PDF document text
    • http://cyc.cz/pictures/clanky/files/13197571508.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/80615672654.pdfIn PDF document text
    • http://finchamauto.com/pics/49604731374.pdfIn PDF document text
    • http://dogomanhnghia.com/uploads/files/gaxaronerid.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/e7f0c51f405484145a5786e3392b75aa/wovezevetexuzipiki.pdfIn PDF document text
    • https://ylwlgwadmin.ylwl.cn/upload/files/kanuw.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/56384478902.pdfIn PDF document text
    • http://lawyergz.net/uploadfile/files/kavumediwovugusi.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/jamavefuvavabalobamon.pdfIn PDF document text
    • https://sistemagestiondpr.co/userfiles/file/fisewexopu.pdfIn PDF document text
    • http://tyextractor.com/d/files/zevexukuxuvena.pdfIn PDF document text
    • http://www.guus.edu.mn/ckfinder/userfiles/files/28371074759.pdfIn PDF document text
    • http://wsmr.us/userfiles/file/gikemumojerim.pdfIn PDF document text
    • http://ntvietnga.com/upload/files/3198896237.pdfIn PDF document text
    • https://bimstudioinc.com/media/files/jovetexisutudibafu.pdfIn PDF document text
    • http://sanxuatbanthinghiem.org/app/webroot/uploads/files/58823044148.pdfIn PDF document text
    • http://gzmingjun.com/uploadfile/files/20210907_063735.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/e49226f30ceebe8b77ff96111b916e1a/94313816423.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/40580744391.pdfIn PDF document text
    • http://pasaru.com/upload/files/tajamixiter.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/nekupefizovotoxuvu.pdfIn PDF document text
    • 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_off0000d055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD055 10968 bytes
SHA-256: eeaafc3b494d4f4766362872838cb04ebc2fd94a70491174de7fcf52ced6d374
font_01_sfnt_off0000e9ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AE 17904 bytes
SHA-256: 5ef55732cf9c73ae02b15468f2852e83dc47ae3afef285d3dad627331a4e7f8c
font_02_sfnt_off000117a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1