Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5fc52909221eb3a…

MALICIOUS

PDF

63.6 KB Created: 2021-01-19 00:39:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 81f1c43310a21bdcae76c6ef68c6762f SHA-1: b744bc2eb410d0502d33e1572dfb222c9e948bf8 SHA-256: b5fc52909221eb3ab2ded17e822ba80bba809ae32c80fda94e4b2c6a16049975
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and exhibiting link farm characteristics, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful sites.

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://baarspo.ru/123?utm_term=folding+bed+frame+wood PDF link annotation
    • https://site-1174368.mozfiles.com/files/1174368/anime_war_episode_9.pdfIn PDF document text
    • https://site-1200115.mozfiles.com/files/1200115/linkin_park_2020.pdfIn PDF document text
    • https://site-1171954.mozfiles.com/files/1171954/xenobezufulunizorewoda.pdfIn PDF document text
    • https://cdn.sqhk.co/luwiwaduna/cRiijgG/gangs_of_new_york_butcher_quotes.pdfIn PDF document text
    • https://site-1166710.mozfiles.com/files/1166710/dafevolanusibik.pdfIn PDF document text
    • https://site-1177229.mozfiles.com/files/1177229/larotodetugaronere.pdfIn PDF document text
    • https://site-1166597.mozfiles.com/files/1166597/kraft_canada_ice_cream_sandwich_cake.pdfIn PDF document text
    • https://site-1168360.mozfiles.com/files/1168360/super_sniper_shot_movie.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://moxawaten.epizy.com/aarariraro_song_hd.pdfIn PDF document text
    • http://fotiworoz.epizy.com/create_application_load_balancer_aws_terraform.pdfIn PDF document text
    • http://wiwekire.epizy.com/magizoologist_tree_guide.pdfIn PDF document text
    • http://kiwozoma.epizy.com/vaxokaxijudusa.pdfIn PDF document text
    • http://fofeparulofiz.rf.gd/wizena.pdfIn PDF document text
    • https://s3.amazonaws.com/gowebabuxogiro/muvabavojarolubun.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_off0000bc93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC93 5236 bytes
SHA-256: c798d9d9e6e163799c7149a6d8cebee2d9dd263fa3739eadec17a59f11634e9f
font_01_sfnt_off0000ce62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE62 10604 bytes
SHA-256: 438f24cf6dd172a663f65ecdf7295f9d5eb36babb90bc7a575da706716531c7b

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