Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4f239033b69d0bc…

MALICIOUS

PDF

73.9 KB Created: 2021-10-04 19:47:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 01a6f3149b28f9270c7eccf59351c509 SHA-1: 6e2f0d3d85006a467a7745c99acf31e9b3b43ed0 SHA-256: b4f239033b69d0bcfabcfce68a20acc9bf01205cc60ff82178cdc99141404510
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs that redirect to various domains, suggesting a phishing or malware distribution scheme. The PDF structure and the presence of external URIs point towards a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://garglob.ru/uplcv?utm_term=miles+to+linear+feet
    • http://stroytehcentr.ru/images/file/xigotopugivorasufomurisa.pdf
    • http://vetsnab32.ru/userfiles/file/pitufevuta.pdf
    • http://jevades.com/aircraft/fckimages/file/74770927819.pdf
    • http://xingyeknitting.com/userfiles/files/59636282831.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed619d128d---41692764829.pdf
    • http://dolinakrzeptowa.pl/public/upload/ckfinder/userfiles/files/tisuseremo.pdf
    • https://yauspeshen.com/ckfinder/userfiles/files/60190323593.pdf
    • http://tatishev.ru/admin/ckfinder/userfiles/files/noxikotovafowow.pdf
    • http://campingwithconvenience.com/files/files/goliguwobodewutisa.pdf
    • https://funcarele.com/ckfinder/userfiles/files/zixovewigapone.pdf
    • https://vieclamday.com/userfiles/file/xikovepiwadopotoxa.pdf
    • http://www.scsk12.org/policy/files/files/sixivukudewenuzomiji.pdf
    • https://fq.ua/images/file/bebivujamorajatavej.pdf
    • http://penzion.sarmo.cz/Images/file/gobovowipaku.pdf
    • http://studiotecnicobonoli.com/userfiles/files/relozanujulezaxananudib.pdf
    • http://beachfirebrands.com/userfiles/file/16136552462.pdf
    • https://netron.pt/app/webroot/media/files/romigadesovevep.pdf
    • http://dispensapertutti.com/userfiles/files/dokivatesuxa.pdf
    • https://chasehr.in/userfiles/file/begilabobodufelepadefik.pdf
    • https://st-stephens-church.com/upload/File/sobitiko.pdf
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/kapolasik.pdf
    • http://mapect.com/upload/fckeditor/file/64058899689.pdf
    • http://111-orte.de/testarea/cwsCMSlight/media/files/wapatamoko.pdf
    • https://bhopalliteraturefestival.com/mpsdp/uploads/files/17189096452.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bff0.bin
56dbd2c415433c28357501e054777b8dbfb10a7fd880d2287681f228560ae1e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBFF0 16888 bytes
font_01_sfnt_off0000eb0f.bin
9e621539ff908313628cc1d4a3f1f2da54dcedf6b088ed015e3cbda504cbd54e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0F 10200 bytes
font_02_sfnt_off0001020f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1020F 16792 bytes

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