Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4369c319bda9ccd…

MALICIOUS

PDF

80.3 KB Created: 2021-09-21 02:00:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 07fba6f76758d5ea1cbdacf5935b3fb3 SHA-1: ca1ff529216a8986675c31fef0534753f1e9dcc2 SHA-256: d4369c319bda9ccdfbb381ed3c2f73e0027d4d4e0e3101dbe8444c867c687acd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to suspicious domains, many of which are structured as link farms. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to obscure the true malicious destination by using multiple disposable hosts and UTM parameters. No scripts were extracted, but the overall structure and URL distribution strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://queure.ru/uplcv?utm_term=play+gta+5+on+android+free PDF link annotation
    • http://branonperformance.com/ckfinder/userfiles/files/78246337803.pdfIn PDF document text
    • https://31app.com/userfiles/file/noramogexavuberuwotata.pdfIn PDF document text
    • http://papaicountrylodge-longstay.com/user_img/files/3549547798.pdfIn PDF document text
    • http://oinfo.cz/userfiles/file/rapokovasonopezumegawo.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/ff6b8933c8cfaea3fe3c5217c8006a3e/nejigunosopekikiritoji.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/17183887524.pdfIn PDF document text
    • https://asiastudy.in/ckfinder/userfiles/files/xemaderazinop.pdfIn PDF document text
    • http://king-tableware.com/uploads/files/202109090601217427.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///tevorudiwejuwinugub.pdfIn PDF document text
    • https://tiemhoamo.tiemhoahaibara.com/data/dulieu/files/4085444783.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/36433073838.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/foxokija.pdfIn PDF document text
    • http://michalpavlicek.com/uploaded/file/58078216480.pdfIn PDF document text
    • http://tacchigroup.com/public/thread/risorse/file/jiwuli.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/bovasibuteridamurada.pdfIn PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/kujukopumitobufexan.pdfIn PDF document text
    • http://st03.it/userfiles/files/fovopibutigop.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/25557777312.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/gukasubu.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161371dffc797f---musizuranipipigevudur.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/wefemilogi.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/42582420221.pdfIn PDF document text
    • https://cissud.eu/uploads/ck_editor/files/78317495648.pdfIn PDF document text
    • http://xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/11808380596.pdfIn PDF document text
    • https://olivermilk.com/tctt/sites/aaa/file/47130189063.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_off0000d79b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD79B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB2 10612 bytes
SHA-256: 52a6173a064b256124d531f0f81dd45d0ab0f19a03019a573601f56888fbe035
font_02_sfnt_off000107f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F2 16800 bytes
SHA-256: 31885f5466abd1eb57d4b63cd20958a732d641db4ef3dd83bcf2b53331d7846d