Malicious PDF — malware analysis report

Static analysis result for SHA-256 bde08b525cc73590…

MALICIOUS

PDF

73.5 KB Created: 2021-09-16 21:01:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 288a5384980e2d8be2b6d8facaae9882 SHA-1: 2f37db3bb5dc489adcebeddee8a3246b507a54c0 SHA-256: bde08b525cc73590bd72e871fc13a9d4468f869c8585acb5003df0d4ae7a411b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple distinct, disposable domains. The presence of numerous unknown URLs suggests a campaign to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://2018.letnifestiwal.pl/ckfinder/userfiles/files/bopakewexafidewo.pdf In PDF document text
    • https://khangle.vn/uploads/images/files/35096462397.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210912153516.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/35233873898.pdfIn PDF document text
    • https://topclassgardening.nl/images/file/savilizanove.pdfIn PDF document text
    • https://pleasanton.com/wysiwygfiles/file/9522446017.pdfIn PDF document text
    • https://leciv.fr/uploads/FCK_files/file/65790751681.pdfIn PDF document text
    • http://www.florentmaussion.net/userfiles/File/32989153592.pdfIn PDF document text
    • http://snft.ro/media/file/pabafilobufewano.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/75863313047.pdfIn PDF document text
    • https://jamurgoreng.net/contents/files/ruwotavinazobizopuganudo.pdfIn PDF document text
    • http://newtrichur.com/userfiles/file/buluxikaneberuger.pdfIn PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/kapuduwugugadoredutuf.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613befd25a13b---52879681669.pdfIn PDF document text
    • http://studiotecniconuti.it/userfiles/files/6297336340.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/wofumobapibe.pdfIn PDF document text
    • http://www.lircai.com/web/inline/file/33577286366.pdfIn PDF document text
    • http://dichvutot99.com/webroot/img/files/bipudenovan.pdfIn PDF document text
    • https://luxm.pl/userfiles/file/95166622673.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/wopujazobutesopaweralix.pdfIn PDF document text
    • https://prospr.fr/ckfinder/userfiles/files/lenoretekute.pdfIn PDF document text
    • http://pomelieagency.com/userfiles/files/35100606208.pdfIn PDF document text
    • http://baby-daycare.com/uploads/files/202109070513294942.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/71543967822.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=detective+chinatown+3+torrentPDF link annotation
    • 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_off0000bdff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDFF 10436 bytes
SHA-256: 4bac302daa986aa0e77a048be56c88be8fd96ec22a4f1042a012f09930f7b310
font_01_sfnt_off0000d5b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B8 16636 bytes
SHA-256: 57ed73d4d95718f721781d666ca0ea34d7a34a316ef91488aaabac07802fb391
font_02_sfnt_off000100b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1