Malicious PDF — malware analysis report

Static analysis result for SHA-256 abb24cdcf1e03fdc…

MALICIOUS

PDF

69.8 KB Created: 2021-09-13 03:46:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 20bab51579c738b2e4bf8db28a64a986 SHA-1: 843b68d1b78824ebb17d362fde99ac0ac1f4731c SHA-256: abb24cdcf1e03fdcf03eafe55655febaa8812bbcc496e5ca8cf5f903a74bca71
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to a link farm, indicating a likely attempt to manipulate search engine results or distribute additional malicious content. While no scripts were directly extracted, the PDF structure and embedded links suggest exploitation for client execution, potentially via embedded JavaScript or a vulnerability.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://koreanhotpot.com/uploads/files/67974012726.pdf
    • http://dralituncer.net/userfiles/file/30724117887.pdf
    • https://threadworx.com/thread/admin/uploads/file/bibal.pdf
    • http://www.zdravotechnika.com/ckfinder/userfiles/files/31627489015.pdf
    • https://terracetemayonetim.com/upload/ckfinder/files/rerufiwawarig.pdf
    • https://gulamanis.com/contents/files/gadokedipovotuzipu.pdf
    • http://bnblspecialities.com/userfiles/files/wenigevuxe.pdf
    • https://audreyheselmans.com/_files/file/87697483753.pdf
    • http://ferramentabelleggia.it/public/file/faladosesabakokokudufalo.pdf
    • http://gatewayhotelbangkok.com/upfile_hotel/files/nomogusedidi.pdf
    • https://jasz-pap.hu/UserFiles/file/19498876703.pdf
    • http://mextro.de/upload/files/lenenazabewuzaros.pdf
    • https://italvaping.com/file/48990664570.pdf
    • https://cualuoihoanmy.com/uploads/userfiles/file/zazewunopememem.pdf
    • http://www.emploi.nat.tn/ckeditor/ckfinder/userfiles/files/kofuwaxim.pdf
    • http://svadbavmoskve.com/content/xuploadimages/file/barajiwuwikabaralez.pdf
    • http://sunnyten.net/userData/board/file/sunujemaxujevologes.pdf
    • http://www.bsa.by/ckfinder/userfiles/files/zawerodosopu.pdf
    • http://awarelaxcentrum.cz/user_files/file/buriwofovorikokuv.pdf
    • https://biharlokmanch.org/userfiles/file/65654199632.pdf
    • https://majubesar.com/contents/files/54061045264.pdf
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/91588556118.pdf
    • http://doorsatyrau.com/ckfinder/userfiles/files/xipuvanokejo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=the+years+virginia+woolf+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_off0000b00a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB00A 16792 bytes
font_01_sfnt_off0000c821.bin
af9da2e9226b71bb0017572134e9187db1c1a1754c5bc99daef21d048b2ad055		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC821 10908 bytes
font_02_sfnt_off0000e12b.bin
45da7980c15cfa5f6d1929b98164380ac3ade9fd80eba37defbe6dd43d0b05c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE12B 15960 bytes

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