Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa15a5d482c8ee6f…

MALICIOUS

PDF

74.9 KB Created: 2021-02-17 00:42:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 1bb99fd495795d289e4cc7f5a6fcb6ce SHA-1: b4d5995001d3e65b9a1f3e206bf25971719df942 SHA-256: aa15a5d482c8ee6f10d9a7090cdd825e6f38e7971e9494b32fb3886e5d71ded0
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, indicating a link farm or redirection scheme. Heuristics suggest it's a link farm on disposable hosting, and ClamAV identifies it as a phishing trojan. The ML classifier also flagged it as malicious. The primary function appears to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/wix?keyword=the+deepest+well+book+pdf PDF link annotation
    • https://cdn.sqhk.co/masunidupag/Ug51pRV/93946207264.pdfIn PDF document text
    • https://cdn.sqhk.co/govibabika/fZhj07a/download_pocket_world_island_of_adventure_mod_apk.pdfIn PDF document text
    • https://kowezuvive.weebly.com/uploads/1/3/4/6/134603832/zuzezivikerotav.pdfIn PDF document text
    • http://gvidilon.ru/conjunctions_exercises_for_class_8_with_answersaoizp.pdfIn PDF document text
    • http://fsfsfd.xyz/mudilejutorutedenivary51a.pdfIn PDF document text
    • https://cdn.sqhk.co/fuluzezufe/YNjfwia/escape_the_prison_13_walkthrough_level_1.pdfIn PDF document text
    • http://picsonair.com/sodasijmnl0r.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445532/normal_5fdd69fb1f55a.pdfIn PDF document text
    • http://kungfumalibu.com/questions_that_matter_an_invitation_to_philosophy_6th_editionpqupz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475853/normal_5fd110161e4c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485568/normal_6016c19dc4b42.pdfIn PDF document text
    • http://usersonlineguardingsettings.site/96962346739fxwg6.pdfIn PDF document text
    • http://furogoverakafex.22web.org/father_stretch_my_hands_piano_sheet_music.pdfIn PDF document text
    • https://cdn.sqhk.co/ditetona/EgjU9jj/space_images_real.pdfIn PDF document text
    • http://gratoraama.space/disawar_satta_king_ki_reportt9xss.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jeruzofifisamen.rf.gd/51484549151.pdfIn PDF document text
    • http://lisuwar.rf.gd/ralajilitififezer.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_off0000eaa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA5 5068 bytes
SHA-256: 9ca9fad53ec116f41b7bf212a0162de5a85c82bf227f9114ef3d18b4ed081342
font_01_sfnt_off0000fbf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF1 10288 bytes
SHA-256: 891d45efa5f5b26bfb4f45fa8f337ee0a630ee5a4474217b21c24a5a28c57e92

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