Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec864735a6c1e221…

MALICIOUS

PDF

83.5 KB Created: 2021-03-26 10:42:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 3c8fb841800a94605f6bbb66170c39bd SHA-1: a7fb6d791c9289face56a801ea5cfad8081980d9 SHA-256: ec864735a6c1e221f14f5acdcbc7ac5cd10e6c46f863e6ba195720e82e8c0b6d
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous external URLs that point to other PDF files, likely for SEO manipulation or to distribute further malicious content. The presence of many external links on disposable hosting supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://golowaki.ru/wix?keyword=first+baptist+church+of+geneva+fl PDF link annotation
    • http://wifunagidoli.mypressonline.com/81803989098.pdfIn PDF document text
    • https://cdn.sqhk.co/lewivapawo/d2IJhcV/fuzubovidekukekeroluben.pdfIn PDF document text
    • http://kdghy.online/black_and_decker_grass_hog_batteryimx20.pdfIn PDF document text
    • http://blacktea.space/37006963486g11q.pdfIn PDF document text
    • http://usacreditscore.info/25649090739y2rr9.pdfIn PDF document text
    • https://cdn.sqhk.co/gavezexu/Sldjvgf/35589154333.pdfIn PDF document text
    • http://helpforteam.com/ethical_hacking_seminar_ppt_freemeepr.pdfIn PDF document text
    • http://idealica-italiaofficial.site/what_is_the_myth_of_odysseusy96ly.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xirixepo/galaxy_s10_plus_wallpaper_template.pdfIn PDF document text
    • https://6eed613e-cbae-405e-b458-9655ef9033f8.filesusr.com/ugd/e4f6f0_8fd9abc50f3746c8b1eac066193aebcc.pdf?index=trueIn PDF document text
    • https://53860ffb-5975-4088-b838-5c82367c2827.filesusr.com/ugd/0d2908_3fd626037dc14397aa0133b434dea131.pdf?index=trueIn PDF document text
    • https://5637a596-61ce-4e67-8953-8fd9cb84b940.filesusr.com/ugd/c20ea7_8484c2a6f4094d219c4a438df0558fab.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/suxugipipolazog/fevofativovelukekut.pdfIn PDF document text
    • https://569e8712-2873-4b93-a654-ea71b6b809e3.filesusr.com/ugd/345929_a1b6347a977c464a9cbc03f32ae110c7.pdf?index=trueIn PDF document text
    • https://0f0532cb-4478-41f9-91a1-cf277c4732ec.filesusr.com/ugd/8acad3_02d804597d674f0e89012af319c578ce.pdf?index=trueIn PDF document text
    • https://45f61934-b4a1-4335-a9e3-e142d9465b5b.filesusr.com/ugd/0dd040_dc798bf2ecb247859edf49f17b8ab24e.pdf?index=trueIn PDF document text
    • https://891dfe3a-8969-4df2-b253-5ccc4ebbb7a0.filesusr.com/ugd/e66789_326d3a1394c5473d88f10a16b0ab4cd6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tipikaxe/the_maze_runner_2_2014_full_movie_in_hindi_download_480p.pdfIn PDF document text
    • http://ziwivazud.onlinewebshop.net/vinylmaster_pro_4_crack.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_off0001097f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1097F 5432 bytes
SHA-256: d6961f31c98be903394b50e0e24f4930969e81d2cc2eecfd41e9cf157025658c
font_01_sfnt_off00011c00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C00 10792 bytes
SHA-256: 7aeae1e4d805f84334fc07a48d557d4bb9bce8d19cadd479ade4edb02396d6b5

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