Malicious PDF — malware analysis report

Static analysis result for SHA-256 450e45117d1b655c…

MALICIOUS

PDF

80.1 KB Created: 2021-09-09 04:51:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 12d014868b842eb72f82563a08b166e3 SHA-1: b5f7b77273d7973fbb7db1747e62c60678057df8 SHA-256: 450e45117d1b655cacf3f379d5b5f9a0bc187568769b4e909c039e854d93eadc
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm, likely to host malicious content or phish users. ClamAV detection and the ML classifier strongly suggest malicious intent, specifically a phishing or trojan distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=iron+man+3+2d+game+download PDF link annotation
    • http://agataklimowska.pl/userfiles/file/74145941402.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/5210310187.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/xugux.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/toruxefutobefapasiwepaza.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/pozofigaterexegepenedilul.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/e732f16b6e8fbd22a8e9fe02e0644e5c/vaxijumapasebutemomedakak.pdfIn PDF document text
    • http://gibisch.org/files/files/62432114347.pdfIn PDF document text
    • http://www.hebrewforreadingcomprehension.com/content/fikofijuligova.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/wusufugapemonepelunurenuz.pdfIn PDF document text
    • http://medtravel.lv/images/hand_uploaded/files/vonenisapesa.pdfIn PDF document text
    • https://cevhertemizlik.com/userfiles/files/wivodaxokowiretoboduge.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/21637354013.pdfIn PDF document text
    • http://lactopad.com/uploads/files/tanakujanu.pdfIn PDF document text
    • http://www.fuchingrading.com/upload/file/34177776100.pdfIn PDF document text
    • http://webminmax.com/userfiles/file/zugufakenufexeretuveno.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/ec4ba1153ac6b1f1645786697131f062/25650038885.pdfIn PDF document text
    • http://mixline.ru/img/lib/file/70881986074.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/fekojewakasutejen.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/fefif.pdfIn PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/72472410564.pdfIn PDF document text
    • http://lor-rostov.su/userfiles/files/fenoxe.pdfIn PDF document text
    • http://tavaszitura.eu/userfiles/files/53763707884.pdfIn PDF document text
    • https://reha.bg/content/upload/file/69045265814.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_off0000d4fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4FC 10560 bytes
SHA-256: 34bfc7f28667f07e2de7d6b6933dc3b5b10d38898a75cffce0683492e26af054
font_01_sfnt_off0000ecec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FE 17588 bytes
SHA-256: e7ff923022fbf5a3cf9c642d59e49b56bbfa2dc4da36bec97c9f684cbf2c8665

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