Malicious PDF — malware analysis report

Static analysis result for SHA-256 af712f84668c3d7c…

MALICIOUS

PDF

95.8 KB Created: 2021-03-17 19:05:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 36d99ab5824729f25cd43aabc697b5ad SHA-1: 2bd139383ccc6c2ad3caeadff90f166e39c9f799 SHA-256: af712f84668c3d7cd1602a63abbfe3e9a66baf19f0fe36c5041460276bae9ce3
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a phishing or malware distribution scheme. The presence of 'utm_term' in one of the URLs further supports a campaign-like structure designed to track user engagement with lures.

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
  • 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.
  • 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 https://soxebez.ru/strik?utm_term=hiking+merit+badge+pamphlet+pdf
    • http://ludibudisiva.iblogger.org/possessive_nouns_worksheet_grade_5.pdf
    • http://salufogi.iblogger.org/ruwubafoxokom.pdf
    • https://static.s123-cdn-static.com/uploads/4376601/normal_5fdeeba1c2859.pdf
    • https://cdn-cms.f-static.net/uploads/4366980/normal_601dded8b5473.pdf
    • https://cdn-cms.f-static.net/uploads/4380072/normal_602a47a01fc15.pdf
    • https://static.s123-cdn-static.com/uploads/4474446/normal_5fee6c0152b6d.pdf
    • http://giveaway2020.info/92147873329cta85.pdf
    • https://cdn-cms.f-static.net/uploads/4460706/normal_5fd11721ab2bd.pdf
    • http://zebatufiduku.22web.org/jobs_you_can_get_with_a_management_information_systems_degree.pdf
    • http://futejupo.iblogger.org/perkembangan_agama_hindu_di_malaysia.pdf
    • http://requiremcgood.com/17197543889mrek7.pdf
    • https://cdn-cms.f-static.net/uploads/4374185/normal_6031b787d0915.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://xagexof.rf.gd/sqlite_to_excel_android_github.pdf
    • http://pidofesixud.epizy.com/98414072636.pdf
    • http://gebibem.epizy.com/raduvezizisa.pdf
    • http://sixekefem.rf.gd/kiwalejenudufaxe.pdf
    • http://roxusenedo.epizy.com/university_of_florida_campus_map.pdf
    • http://luwulifinuneti.epizy.com/encyclopedia_of_science_and_technology.pdf
    • http://xawabaxazulaga.epizy.com/lagu_be_alright_nightcore.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012d8c.bin
126acda6f06e1675870d0ccd39ea4e064a3e5fc9c78b1fecb9ca5df46eea5c50		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D8C 5120 bytes
font_01_sfnt_off00013eb4.bin
ce08593f6166ca0848d2cf8e723c861d75f8ac4922fc789c1dad66fb97b53b57		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13EB4 10964 bytes
font_02_sfnt_off0001641f.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1641F 4324 bytes

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