Malicious PDF — malware analysis report

Static analysis result for SHA-256 edb33324e143c0d7…

MALICIOUS

PDF

154.8 KB Created: 2021-03-01 11:00:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 2b6df645f2838e939e567a249ede3ffd SHA-1: eee5cb8aaf07e83cb3256739e373b9fdce4a1bc1 SHA-256: edb33324e143c0d77f6e45e26f0f36b5aaa352c1c4f4b5158f9e9fe813e04ee6
146 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are associated with link farms and disposable hosting, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of malformed streams and external URIs further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://baarspo.ru/123?utm_term=critique+of+pure+reason+pdf+norman+kemp+smith PDF link annotation
    • http://luminar4-download.xyz/full_list_of_italian_irregular_verbsaf1c7.pdfIn PDF document text
    • http://vasakuso.sportsontheweb.net/savamixiruripevu.pdfIn PDF document text
    • https://fopudodesesiwen.weebly.com/uploads/1/3/4/3/134344932/nixokokavesu.pdfIn PDF document text
    • https://sizokagijabid.weebly.com/uploads/1/3/4/6/134652394/murojinuliwixaju.pdfIn PDF document text
    • https://jumojebanofoz.weebly.com/uploads/1/3/5/3/135302369/1292719.pdfIn PDF document text
    • http://barajofa.mywebcommunity.org/does_fender_fuse_still_work.pdfIn PDF document text
    • http://arboozfilm.com/driving_test_success_practical_simulator_pc9ut7s.pdfIn PDF document text
    • https://minaraxu.weebly.com/uploads/1/3/4/7/134765114/476632b82bcf7b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393911/normal_60232e382379e.pdfIn PDF document text
    • http://eagleaff.com/islamic_song_99_names_of_allahod7oq.pdfIn PDF document text
    • http://pornbustyvids.com/what_is_the_humidity_outside_right_nowupr5v.pdfIn PDF document text
    • http://myyshooop227.site/used_coleman_generators_for_saletz2ch.pdfIn PDF document text
    • http://boevoenlp.com/acer_s231hl_monitor_specswmzut.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
    • 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_off000212eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x212EB 5344 bytes
SHA-256: f0b598c1c439448d8989c52dad90bdae6a34e45ab22741752570b6f190aaaca1
font_01_sfnt_off000224e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x224E8 12948 bytes
SHA-256: 61c1cafdc70753f13da00288b67454c16bc6af53b43805364c234fd315823567
font_02_sfnt_off00024f01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24F01 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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