Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fcab87bcdfe0898…

MALICIOUS

PDF

80.5 KB Created: 2021-09-19 17:34:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 4f182477a44d083975eab82a5417d5c6 SHA-1: 66d8b4e9421e343c054a123c0bedbfe669eb9018 SHA-256: 7fcab87bcdfe0898e2b00d098a7e8d0b9c81252d6e9ab2c305e2ccc5afa57297
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. It contains numerous external URIs, with one specifically pointing to a URL related to 'clash of clans hack version update', suggesting a lure for potentially harmful content. The PDF structure and embedded links indicate it's designed to redirect users to external sites, likely for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://synerhu.ru/uplcv?utm_term=clash+of+clans+hack+version+update PDF link annotation
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/ab056e54ce620b4314fabb0db78728b0/84928860785.pdfIn PDF document text
    • https://tauthuy.vn/upload/files/5508118693.pdfIn PDF document text
    • http://iuf.kr/pds_down/files/komipibimumuzedate.pdfIn PDF document text
    • http://alvit-bk.ru/userfiles/file/pepebiza.pdfIn PDF document text
    • http://kmkonsult.cz/userfiles/file/9134110406.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/5911455326.pdfIn PDF document text
    • https://38e5bbdfe8be.gdziezjesc.info/userfiles/file/23403947152.pdfIn PDF document text
    • http://bidwoodmachine.com/d/files/27047516150.pdfIn PDF document text
    • https://pacantioquia.org/aym_image/files/45588635698.pdfIn PDF document text
    • https://titishop.co/upload/files/59971646219.pdfIn PDF document text
    • http://climacom.eu/userfiles/files/29011221515.pdfIn PDF document text
    • http://radyoislam.com/resimler/files/zozidipiparelizinapem.pdfIn PDF document text
    • http://yksskj.com/ckfinder/userfiles/files/12575294586.pdfIn PDF document text
    • http://budaors.varosom.hu/userfiles/files/gogilebivomatavozij.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/dexakiworagesizoje.pdfIn PDF document text
    • https://alariel.be/userfiles/file/mofokulovuvomanojukuvigid.pdfIn PDF document text
    • https://tahsindincer.com/upload/ckfinder/files/40887362934.pdfIn PDF document text
    • https://pmrmhss.com/userfiles/file/1417093764.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/21547641020.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/96771696452.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/23211885729.pdfIn PDF document text
    • http://studiotecnicolamanna.com/userfiles/files/retapuwapewar.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/17903995835.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/jawiruvipupumavemuz.pdfIn PDF document text
    • http://b40555.handyfriendship.com/upload/files/zisif.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_off0000d430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD430 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC42 17880 bytes
SHA-256: 23b488eaac2afe6e4afde7ec714d7258bf701aa37105380864f1c3b14dfbc013
font_02_sfnt_off00011a82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A82 11008 bytes
SHA-256: cea34f3a0f61c4bacd2428bada20806a1f831d747819c4914077cc216e08cc6e