Malicious PDF — malware analysis report

Static analysis result for SHA-256 b335e2a2c176b068…

MALICIOUS

PDF

70.2 KB Created: 2021-09-25 14:50:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2d7503e0c7858cfdf3d77e85225d14f2 SHA-1: b8a8ada12c1ac407fba56b23f1088217d77b5548 SHA-256: b335e2a2c176b0682edf9f285ab1069c65d5178368e12eef6976e38513e2c615
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs pointing to external sites, indicating a likely phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a tactic of using many links on disposable hosting to obscure the true malicious destination. No scripts were extracted, but the presence of external URIs is a strong indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://laborke.ru/uplcv?utm_term=angry+birds+isle+of+pigs+android PDF link annotation
    • https://irisapp.cn/uploadfiles/fckeditor/20210907/file/16310123065436.pdfIn PDF document text
    • http://fishngrill.iorderfoods.com/uploads/files/pibusono.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/38496721606.pdfIn PDF document text
    • https://urbanshapes.in/userfiles/file/dugexejipetepalejum.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/nidatarijirizidaw.pdfIn PDF document text
    • https://produktybhp.pl/pliki_user/File/zetujirisiw.pdfIn PDF document text
    • https://biothiennam.com/media/ftp/file/28901971949.pdfIn PDF document text
    • https://venusnvs.com/userfiles/file/zewedusipuz.pdfIn PDF document text
    • https://www.studiorosaliabusco.it/ckfinder/userfiles/files/mupur.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/56869820703.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/gajet.pdfIn PDF document text
    • https://vozilasavozacem.rs/files/57959723493.pdfIn PDF document text
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/zukigezurorekidusexa.pdfIn PDF document text
    • https://sevenhillsgroup.net/ckfinder/userfiles/files/kurufuki.pdfIn PDF document text
    • https://sunnyvale.com/wysiwygfiles/file/xevoxiga.pdfIn PDF document text
    • http://amkchem.com/upload/files/92593475548.pdfIn PDF document text
    • https://bulgariapools.com/contents/files/dokudefunubusukadilabage.pdfIn PDF document text
    • http://93564497.com/userfiles/84785122627.pdfIn PDF document text
    • http://klhl.com/userfiles/file/wedutaxidi.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/libowu.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210925130712.pdfIn PDF document text
    • http://studiodelcorso.eu/userfiles/files/97315280264.pdfIn PDF document text
    • https://ultralloy.net/upload/files/12875564919.pdfIn PDF document text
    • https://healthtecindia.com/userfiles/file/45615813283.pdfIn PDF document text
    • http://e-sportis.com/images/upload/63630221527.pdfIn PDF document text
    • https://termoformat.md/img/files/59142600172.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_off0000b0c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0C9 16964 bytes
SHA-256: 2d43991bcd7c2fecbb741325b60a46d36ff7286d1141b496555b68d4e9190c2f
font_01_sfnt_off0000dab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f2ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CA 10808 bytes
SHA-256: 6e3a54080b0879bcbc5226e0e245a2c54ae8fc0f4b5afffadff29465c573396c

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