Malicious PDF — malware analysis report

Static analysis result for SHA-256 a11262dd4bf859d3…

MALICIOUS

PDF

81.6 KB Created: 2021-01-22 06:16:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 80a61699a738ee30507d96bfaef8f95a SHA-1: 27c2773dd38a92f334e97615615177c91531d00f SHA-256: a11262dd4bf859d3186b096f697e8e9b351e83e6b78f88074126c7436ff8bd13
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The heuristic firings indicate the PDF is designed as a link farm on disposable hosting, aiming to redirect users to malicious sites. While no scripts were explicitly extracted, the nature of the embedded links and the ML classification strongly suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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 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/aws?utm_term=feedback+analysis+report+format In PDF document text
    • https://jabibodusap.weebly.com/uploads/1/3/2/6/132681053/934313.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443342/normal_5fcbd47493f4b.pdfIn PDF document text
    • https://pewarefat.weebly.com/uploads/1/3/4/3/134361746/2bde1bb6b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501360/normal_6007752f75d80.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502721/normal_5fd044208d4cb.pdfIn PDF document text
    • https://cdn.sqhk.co/veludewozen/ibPxW8X/gafadi.pdfIn PDF document text
    • https://laximazerafa.weebly.com/uploads/1/3/4/2/134235816/zuzadexuj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413845/normal_5fe5b020c5c02.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496204/normal_5fec6878ee455.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449014/normal_5fc84484eefb5.pdfIn PDF document text
    • https://wajovojov.weebly.com/uploads/1/3/4/6/134652085/1690955.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ruxopagotar.epizy.com/27254242059.pdfIn PDF document text
    • http://pisumapopub.rf.gd/42998116297.pdfIn PDF document text
    • http://bogasupi.rf.gd/bluetooth_free_for_pc_windows_8.pdfIn PDF document text
    • https://s3.amazonaws.com/fasudikek/rezuxewezekune.pdfIn PDF document text
    • https://s3.amazonaws.com/vufupu/kitchenaid_artisan_blender_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/tinezedu/15904763605.pdfIn PDF document text
    • https://s3.amazonaws.com/pazatuv/cowboy_bebop_intro_song.pdfIn PDF document text
    • https://s3.amazonaws.com/jupevuxirapi/66031395625.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10489 5564 bytes
SHA-256: 17a4f6c5582990d8e705e0ddcd36860cab2c7a4bc8631dda8c75690e52a54b27
font_01_sfnt_off00011769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11769 9972 bytes
SHA-256: 840d881c28e8a69443a11e8cb679a7825b58c416d968b236c3912b27978bd531

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