Malicious PDF — malware analysis report

Static analysis result for SHA-256 102c2982b614a34b…

MALICIOUS

PDF

83.4 KB Created: 2021-09-12 05:57:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: ac57b09e8924999c3fa2a3d920a07cb3 SHA-1: 51a34494378fd2edc26b5dd3ed84e8744f48f5ce SHA-256: 102c2982b614a34bf1efc1ff8131e07632e5bc55878bda3589bf93cfd53290a1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links pointing to various domains, many of which are identified as a link farm on disposable hosting. ClamAV and an ML classifier flagged this PDF as malicious, specifically as a phishing trojan. The presence of a download button lure and callback phishing indicators further support a malicious intent to trick the user into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://asid.rw/userfiles/file/vafakoj.pdf In PDF document text
    • http://residencelesaline.it/userfiles/files/vukirivudoxe.pdfIn PDF document text
    • https://best-of-geldanlagen.de/userfiles/file/28692928143.pdfIn PDF document text
    • http://otestmanager.org/club/data/userfiles/file/20210903080452.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/dobuwikekivugijelexu.pdfIn PDF document text
    • http://rnralpha.cz/res/file/digaseperenunuzolaxovoful.pdfIn PDF document text
    • https://ev-owners.jp/userfiles/files/84704823159.pdfIn PDF document text
    • http://tajilin.com/upload/files/13845048958.pdfIn PDF document text
    • https://universitecentrale.net/uploads/FCK_files/file/wejetezebosusopu.pdfIn PDF document text
    • https://arerp.kr/data/file///76683975191.pdfIn PDF document text
    • http://erdbau-rauch.at/24511505525.pdfIn PDF document text
    • http://lionsmarsala.it/userfiles/files/zibawiraniris.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/zimomazutegeboniluzaxonal.pdfIn PDF document text
    • https://mt-creativestudio.com/ckfinder/userfiles/files/lisunadubano.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/59093632710.pdfIn PDF document text
    • https://alkathirilaw.com/userfiles/files/9012985193.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/42540323805.pdfIn PDF document text
    • http://www.oomewatersport.nl/upload/files/84283132823.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/163117725368.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/jozogunonolijotebakigifu.pdfIn PDF document text
    • http://shijijiaming.cn/filespath/files/20210912070851.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=shadow+fight+modded+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_off0000e20e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE20E 17468 bytes
SHA-256: 874583706fd8aebeda57d10259640ebf9d6ac7781b0c0d45f0757b504d97edef
font_01_sfnt_off00010f53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001276a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1276A 10780 bytes
SHA-256: f03446ca84985294be22956030ff2f17308b52cc65acbe7c8bea38e1b6e6e81f