Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c4370b018516f88…

MALICIOUS

PDF

82.9 KB Created: 2021-09-10 04:04:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0f00b3fa6be217366de69f6b9ed83082 SHA-1: 53042911c5919d479c1410bb8f16a5ec94141be1 SHA-256: 0c4370b018516f88e2a21a93550341f3d226b0f4074c9b7927c96253953d2a3a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://smidgel.ru/uplcv?utm_term=farm+heroes+apk+download PDF link annotation
    • http://www.mezmat.ru/ckfinder/userfiles/files/28322639939.pdfIn PDF document text
    • http://laserbeautymachine.net/d/files/32638352167.pdfIn PDF document text
    • http://como.gattinonimondodivacanze.it/themes/userfiles/files/69673480187.pdfIn PDF document text
    • http://centonze-vini.com/userfiles/files/20087764380.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/jujunuxubagagunevito.pdfIn PDF document text
    • http://musicpark-live.com/userfiles/file/74709581461.pdfIn PDF document text
    • http://rana-international.com/userfiles/files/56689949466.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/5e4a1c71038a1d14f038efdb50b60a8b/kekubewuwepapezak.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/xofufefofumabokewemitew.pdfIn PDF document text
    • http://parkety-patemal.sk/files/file/90023560078.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/wokozomipasodifu.pdfIn PDF document text
    • http://abbuffalowings.com/uploads/files/tenemabobasagejezum.pdfIn PDF document text
    • https://renhedc.com/uploads/files/202109021452579497.pdfIn PDF document text
    • http://haihengpharm.com/upload/files/tesosi.pdfIn PDF document text
    • http://373113.linker.tw/files/fedilokarorajomerek.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a599e2e1a---38875157051.pdfIn PDF document text
    • http://daisin1977.com/js/upload/files/vomasanegafi.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/nuvovakebitogupitit.pdfIn PDF document text
    • https://www.funes.gob.ar/ckfinder/userfiles/files/puliza.pdfIn PDF document text
    • http://isotope3.pm-ural.com/uploads/files/wojuvuzamixidoradifajedit.pdfIn PDF document text
    • http://heryeryesil.com/resimlerfiles/5193024133.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/bupuvopudov.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/lutabimav.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/mimenogolipeli.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_off0000e1c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C5 17076 bytes
SHA-256: 30fe579032d1c6ed555e2fc1cf73b5fb250cf624ec04792037c645959da1866d
font_01_sfnt_off00010dec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12603 10624 bytes
SHA-256: 1e73beb650a23d90dcff4c80835aae256e8f32ea8bcda082e0dbcd12f5dbdbf8