Malicious PDF — malware analysis report

Static analysis result for SHA-256 f85be5b693591dab…

MALICIOUS

PDF

80.1 KB Created: 2021-09-18 19:57:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9d82e6baad7856e17d024f801e0011b1 SHA-1: 415f7bd12c82d70a1cd317db5aae0340c86af8db SHA-256: f85be5b693591dab6be536077e7f75429962a7ef39a8ce85a946faf7d555f7aa
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://exclusivelimoservice.com/ckfinder/userfiles/files/kezisanopet.pdf
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/98278011379.pdf
    • https://www.tulsarad.com/my_content/js/ckfinder/userfiles/files/57745779950.pdf
    • http://interroadholland.nl/userfiles/file/26318500120.pdf
    • http://2990592.ru/ckfinder/userfiles/files/38449457754.pdf
    • https://iohrp.org/f_files/files/miribabepowop.pdf
    • http://cn-junsheng.com/upload/file///202193194699482.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138372b95774---135706460.pdf
    • https://nezrenpin.com/calisma2/files/uploads/tubavaj.pdf
    • http://audidalys.lt/ckfinder/userfiles/files/povip.pdf
    • http://revize-elektro.info/UserFiles/File/16957442779.pdf
    • https://lochoanggia.com/upload/files/48631925217.pdf
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16142032feffa6---sisurusajelirix.pdf
    • http://thuexe7cho.vn/upload/files/78802997599.pdf
    • https://tour-paris-guide.com/cite_imgs/file/2102331192.pdf
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/7300727128.pdf
    • http://csc0512.com/userfiles/file/20210905015906_tmbg2j.pdf
    • https://alsharqcc.com/userfiles/files/27711231286.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=the+conjuring+2+torrentz2
    • 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_off0000d335.bin
ef278fbbd85b456dc7ce167a5b7e3433e0ceac8691beb0e91de4f0a2a4154b2c
pdf-font-stream PDF embedded font (sfnt) at offset 0xD335 10508 bytes
font_01_sfnt_off0000eb1f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1F 16792 bytes
font_02_sfnt_off00010331.bin
63622362b384a605b4b6ec0528e6c0e079893bffd8b941631cf97a35e058a6bc
pdf-font-stream PDF embedded font (sfnt) at offset 0x10331 18512 bytes