Malicious PDF — malware analysis report

Static analysis result for SHA-256 6162c06f8949b596…

MALICIOUS

PDF

83.6 KB Created: 2021-01-16 14:55:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 5fe38225465243cd4349f1098680864d SHA-1: e9148e3fb8ad80a41242d50eaf035d35b485ac5a SHA-256: 6162c06f8949b59604cc80e8954da411c810bb30f362ac8aed41b5ddb034ef8a
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 ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to lure the user to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://traffmen.ru/123?utm_term=does+northwestern+elementry+dont+have+school In PDF document text
    • https://fuzimisadu.weebly.com/uploads/1/3/5/3/135319831/8694259.pdfIn PDF document text
    • https://site-1171384.mozfiles.com/files/1171384/anti_lock_braking_system.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365542/normal_5f8f27048100a.pdfIn PDF document text
    • https://site-1176253.mozfiles.com/files/1176253/fevupilaluwitupadefina.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481528/normal_5fc828612bd52.pdfIn PDF document text
    • https://zapizurur.weebly.com/uploads/1/3/4/9/134900478/63661b1236820.pdfIn PDF document text
    • https://cdn.sqhk.co/mejofiwog/MggzhcU/classic_arcade_space_shooter.pdfIn PDF document text
    • https://cdn.sqhk.co/bugininaxi/bwhesjb/duwupafat.pdfIn PDF document text
    • https://site-1175261.mozfiles.com/files/1175261/free-_living_freshwater_protozoa_a_colour_guide.pdfIn PDF document text
    • https://femovoba.weebly.com/uploads/1/3/0/7/130775826/virufo_tukas_gazuribona.pdfIn PDF document text
    • https://ruwatija.weebly.com/uploads/1/3/4/8/134846771/fosib-venewavetaw-boxelut.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/rudelazifizuvo/abbreviation_worksheet_for_grade_3.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000faf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF6 5172 bytes
SHA-256: 7ffbae30e5d531327dd19ed676a46c1ff728d591baf33d24b9d742a413d87678
font_01_sfnt_off00010c73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C73 11000 bytes
SHA-256: 67f2b4802ea28992e91d3bf65b8aee1271ce8f968756fa4a8590256599d1d52e
font_02_sfnt_off0001317b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1317B 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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