Malicious PDF — malware analysis report

Static analysis result for SHA-256 586495acd067df34…

MALICIOUS

PDF

83.9 KB Created: 2021-09-17 03:28:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 997f3ae79dbd02622591e29615d2d198 SHA-1: 838251f0fb330933b301a36f523622f79ed7a7ec SHA-256: 586495acd067df3482336b114dcfb934bc11c91c52f4c26db8b7bc3332b384b9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating an attempt to redirect the user to malicious websites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript points to T1059.007, and the nature of the file suggests it was likely delivered as a Spearphishing Attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://philabc.ru/uplcv?utm_term=how+to+get+the+wifi+password+from+mobile PDF link annotation
    • http://yuanyoujie.vip/userfiles/file/52825765830.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/70499322183.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/wekoderodufadetije.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/51250834834.pdfIn PDF document text
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/gajixa.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/38711329297.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/bevudoxagopigipavoniz.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/mepozivelugusutogiso.pdfIn PDF document text
    • http://soyaksiesta3.com/userfiles/file/24594299772.pdfIn PDF document text
    • http://everbeenmagnet.com/js/upfiles/files/46045790919.pdfIn PDF document text
    • https://phunhai.net/upload/files/98474801129.pdfIn PDF document text
    • http://yourtruck.be/upload/ckeditor/file/68446566998.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/lepubejidig.pdfIn PDF document text
    • https://marugame.hk/editor_upload/file/50506446235.pdfIn PDF document text
    • https://vetregistr.com/ckfinder/userfiles/files/simadadafaxaparuvo.pdfIn PDF document text
    • http://vtaky.sk/media/file/zipeludajaramawufo.pdfIn PDF document text
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/50929872696.pdfIn PDF document text
    • http://learningkey.org/userfiles/pakerasasawamosag.pdfIn PDF document text
    • http://dpsnowodworze.pl/userfiles/file/12359682016.pdfIn PDF document text
    • https://www.adom.biz.pl/ckfinder/userfiles/files/zuwaxusozovuku.pdfIn PDF document text
    • http://bfttacg.marketsearching.com/upload/files/letatuxuruxepi.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/24045930270.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/57802888056.pdfIn PDF document text
    • http://pcccmiennam.com/media/ftp/file/84159957800.pdfIn PDF document text
    • http://denki-shonan.com/uploadsfile/zedixelomizejaxowij.pdfIn PDF document text
    • https://majubesar.org/contents/files/bamadepomukapoxewerota.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_off0000e214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE214 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA26 18000 bytes
SHA-256: d709d554c182d9a1373ca5332194d1e515a36adae6ecbe80b44b54a99791d1ed
font_02_sfnt_off0001280b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1280B 11056 bytes
SHA-256: b213de8c9252bbabb6d213a5e2d338b495c9d6bd8a12a45165cd5ebc87410b5a