Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bfdcd03564d3a96…

MALICIOUS

PDF

82.0 KB Created: 2021-09-20 17:28:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 7e103a22a09ba8097f0575e3d38965f2 SHA-1: c36a15a155e1f299860bc1eb4d2651df100701c5 SHA-256: 2bfdcd03564d3a9657612b975b65e782543102eb2ec4903281ed8771787e2438
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs, with one specifically pointing to a URL containing 'mod apk unlimited money', suggesting a lure for potentially unwanted or malicious applications. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links on disposable hosting, reinforcing the malicious intent. ClamAV detection as 'Pdf.Phishing.Trojan' further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://krisoc.ru/uplcv?utm_term=airplane+chefs+mod+apk+unlimited+money PDF link annotation
    • http://neodentpetrosino.it/userfiles/files/nominazasulolusemo.pdfIn PDF document text
    • http://unibox.lv/files/text/84034277265.pdfIn PDF document text
    • http://sportsgarten.com/editorData/file/kiteperekituviraloxetak.pdfIn PDF document text
    • https://heart-calligraphy.com/uploads/files/202109120720021001.pdfIn PDF document text
    • http://marinaxaraes.com.br/ckfinder/userfiles/files/gidazifukaroridusoxi.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/xonove.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131a9d6c47c0---watowijesewufimagonow.pdfIn PDF document text
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/14463596349.pdfIn PDF document text
    • http://intranet.uts.edu.co/portal/app/ckfinder/userfiles/files/jedanasiretijazowupupoj.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/70150228987.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/2021920_61433_626.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents/files/12161953386.pdfIn PDF document text
    • https://rivieresoceanie.com/ckfinder/userfiles/files/77543342181.pdfIn PDF document text
    • https://nepalfinepashmina.com/userfiles/file/25827437689.pdfIn PDF document text
    • https://handinhand-daycare.com/ckfinder/userfiles/files/weranerux.pdfIn PDF document text
    • https://www.area-tlc.com/public/ckfinder/userfiles/files/posumofizivuta.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/wagedejepowazekisabizodes.pdfIn PDF document text
    • https://coffeetuanvang.com/Images_upload/files/52282507138.pdfIn PDF document text
    • https://www.bramfordgc.co.uk/ckfinder/userfiles/files/nepizufokatijikavatazo.pdfIn PDF document text
    • https://charteriraq.ir/basefile/charteriraqir/files/ruzogixaxuzepigonupe.pdfIn PDF document text
    • https://altsovmun.ru/userfiles/file/84369765871.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133495675648---kaxusi.pdfIn PDF document text
    • http://apicn.net/upload/files/vewiserubuxuden.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_off0000d839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD839 18488 bytes
SHA-256: 48c3b5e4c0f297bc57aaa8fbef5a952fdd738e722734b0f77628b0528a70b7a6
font_01_sfnt_off00010854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10854 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001206b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1206B 11172 bytes
SHA-256: cfdd339fa8ce34b41bb5aa6566ce4923b97cf78a6e83bc05cc0ba3dea0084139