Malicious PDF — malware analysis report

Static analysis result for SHA-256 edda0f56a531ac6b…

MALICIOUS

PDF

76.4 KB Created: 2021-01-12 22:05:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 6fd397d9c1f9bbdf4085abcf6649b382 SHA-1: 8e19f34840969f86127c2282e4c3a876b68ebe49 SHA-256: edda0f56a531ac6b809016fbc8342b7bf8c1929ba43952d971ce30eca9ff72dd
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded links, with at least one identified as a redirector to known malicious infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The document body is heavily obfuscated and unreadable, providing no further context on the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://gettraff.ru/aws?utm_term=chocapic13%2527+s+shaders+1.+14.+4 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4405946/normal_5fe88bb5b46a9.pdfIn PDF document text
    • https://site-1168140.mozfiles.com/files/1168140/kakudegoko.pdfIn PDF document text
    • https://site-1246207.mozfiles.com/files/1246207/hcna_certification_guide.pdfIn PDF document text
    • https://site-1174313.mozfiles.com/files/1174313/bluestacks_free_for_pc_32_bit.pdfIn PDF document text
    • https://site-1175981.mozfiles.com/files/1175981/94217601519.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382614/normal_5fcd3d2769918.pdfIn PDF document text
    • https://cdn.sqhk.co/jajotulix/gcmPHhf/15317596315.pdfIn PDF document text
    • https://site-1176116.mozfiles.com/files/1176116/windows_10_latest_version_iso_preactivated.pdfIn PDF document text
    • https://foraketarikovef.weebly.com/uploads/1/3/4/6/134608655/wixifuxo.pdfIn PDF document text
    • https://fepobiwebefu.weebly.com/uploads/1/3/4/5/134592484/f08e197.pdfIn PDF document text
    • https://site-1168114.mozfiles.com/files/1168114/viwusafivozifa.pdfIn PDF document text
    • https://site-1174531.mozfiles.com/files/1174531/duxibal.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lijopavexanuse/greatest_weakness_sample_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/muvemasoxaji/alter_ego_a1_hachette.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
    • 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_off0000d977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD977 5404 bytes
SHA-256: 957aef63235b624e702171b27340b42852668599e286a65db6c38a544a006ef0
font_01_sfnt_off0000ebe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE2 10472 bytes
SHA-256: ec6ed6d573418cf3067ff80ed8189220a93b0f49bcec97ed4b71608de7de1705
font_02_sfnt_off00010fe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE6 16064 bytes
SHA-256: f7fb55aa7df24da556f1e6a14ff3e973b5c7274e6851c040e899454d18355684

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