Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0f870d2fe24a6b2…

MALICIOUS

PDF

82.7 KB Created: 2021-09-12 10:15:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3c89ab05e8384ba4766e5ef87dcb0a23 SHA-1: 187a9a2cc30452b756339780ffe7eb140d63f6d3 SHA-256: b0f870d2fe24a6b2d48c65fe1ade584d4e3e41beb20f47dbad2cb3ba1324bcf2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is flagged as a link farm on disposable hosting, suggesting it's used to redirect users to potentially harmful content. The presence of embedded URLs and the PDF structure point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://synerhu.ru/uplcv?utm_term=audio+manager+apk PDF link annotation
    • https://praktijk.zorglink.nl/ckfinder/userfiles/files/47832475373.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/kvmk06u1o0jopaj0f9o0e5fj27/pubamabeluzedaxirijubi.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/zuribubudimorij.pdfIn PDF document text
    • http://sgo-bage.com/public/files/files/38410129038.pdfIn PDF document text
    • http://xn--66-6kc8bfmkmjd.xn--p1ai/admin/ckfinder/userfiles/files/xudedu.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210902081156_2ac2cz.pdfIn PDF document text
    • http://curvesncontours.com/userfiles/file/bivozesidov.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/84061836600.pdfIn PDF document text
    • http://blekinge.boj.se/uploads/userfiles/files/lamasidabunudelemujogika.pdfIn PDF document text
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/55009782581.pdfIn PDF document text
    • https://kccegis.com/upfiles/content/file/20210905151545.pdfIn PDF document text
    • https://ibextrail.com/editor-images/giwotunebovazoxejev.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/22912880768.pdfIn PDF document text
    • https://kclandscapes.com/ckfinder/triplebuserfiles/file/75201250013.pdfIn PDF document text
    • http://only-svet.ru/upload/files/sovunefe.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/vuxafotet.pdfIn PDF document text
    • https://kaptenhoki.net/contents/files/41508737572.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca70b0ccc0---81679680559.pdfIn PDF document text
    • http://bhartiyambeohari.in/userfiles/file/39968279575.pdfIn PDF document text
    • http://coverybox.box8websites.com/ckfinder/userfiles/files/kedudutonevarulexipazize.pdfIn PDF document text
    • http://lovesenergy.com/file/48015768416.pdfIn PDF document text
    • http://smartwealthhk.com/userfiles/filukosuronipegilixobi.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/ptoeh5brka907madspbvs0s1m2/gefuwez.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image/files/67680791117.pdfIn PDF document text
    • https://magicdiscoradio.com/userfiles/file/30279533776.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE91 18048 bytes
SHA-256: f5539e789d858f24805b0f63f57b9c19ac45c174d861800ce8e351385bbdb143
font_01_sfnt_off00010d59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12570 10596 bytes
SHA-256: a5fdf3f4788681daccfe93aae10c2503a2cd537dd6a801763a660974ba2bb8c6

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