Malicious PDF — malware analysis report

Static analysis result for SHA-256 f72cc2de38e020fc…

MALICIOUS

PDF

82.6 KB Created: 2021-01-14 13:05:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 754d0ceb314ac6fb5de08a01a98b6481 SHA-1: 760c5bccec685a553b5c7eef2749f6f8e543a4f1 SHA-256: f72cc2de38e020fc311e4724d1282a9dd4d44e31139e57e3b2a18b02bcea6966
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by multiple heuristics, including a critical alert for linking to known malicious redirector infrastructure. It functions as a link farm, containing numerous embedded URLs that point to external PDF files hosted on disposable domains. The primary purpose appears to be directing users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • 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://traffking.ru/123?utm_term=navigon+europe+apk+8.5.2 In PDF document text
    • https://mawanegofarate.weebly.com/uploads/1/3/4/4/134466522/9049954.pdfIn PDF document text
    • https://cdn.sqhk.co/kufedefivuvu/ePNijgg/91437166486.pdfIn PDF document text
    • https://cdn.sqhk.co/vujenibolo/c7KFjea/fake_call_video_mermaid_games_online_free.pdfIn PDF document text
    • https://cdn.sqhk.co/bofogarabu/Ijc77hh/48986508380.pdfIn PDF document text
    • https://cdn.sqhk.co/saseponirifa/eieB1jf/auto_hashtags_apk.pdfIn PDF document text
    • https://site-1234079.mozfiles.com/files/1234079/sago_mini_world_apk_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/fosasukenum/JIicC4i/werepobilin.pdfIn PDF document text
    • https://site-1241652.mozfiles.com/files/1241652/mupuduwagitadenu.pdfIn PDF document text
    • https://cdn.sqhk.co/moviferu/HNhjibY/vusagikizilawug.pdfIn PDF document text
    • https://site-1175916.mozfiles.com/files/1175916/cardboard_boxes_for_moving_costco.pdfIn PDF document text
    • https://site-1180408.mozfiles.com/files/1180408/selekivufege.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417308/normal_5fc688708b911.pdfIn PDF document text
    • https://burufazifefep.weebly.com/uploads/1/3/4/5/134584298/2706886.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn 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_off0000e9b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B7 5352 bytes
SHA-256: 7156157d0c2fc26fa2dc63b5002bfa8e2641ccc72f0006e8ac694652a986f8a5
font_01_sfnt_off0000fc16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC16 11016 bytes
SHA-256: f8f2ce69e7fa8ef1fadd0a342a5a59ccbb711df05faeb67b613cc17b36165308
font_02_sfnt_off000121b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B1 18088 bytes
SHA-256: b285abf12b05fb7427761554d39f6cfce3946d6666308a688aeb6a8e5662c2a1

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