Malicious PDF — malware analysis report

Static analysis result for SHA-256 12a815c4e4104fd4…

MALICIOUS

PDF

85.3 KB Created: 2021-09-21 23:11:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: ce0d9e3adf4f7949925a739e5ff576e2 SHA-1: babbca32ae9d9a4c0381321a5d6f6ae9c4b755c1 SHA-256: 12a815c4e4104fd4b4cc5281803fc09f2be89cc955dffaec604ee8cda89802f8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a machine learning model and ClamAV, indicating malicious content. The presence of numerous embedded URLs, many of which are part of a link farm on disposable hosting, suggests a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious intent, likely to redirect users to compromised or malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 5

  • 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.
  • 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://pixomot.ru/uplcv?utm_term=fitness+apps+android+wear PDF link annotation
    • https://robindayne.com/ckfinder/userfiles/files/20753163168.pdfIn PDF document text
    • https://xn--80apefbdm9ah5g.xn--p1ai/userfiles/96853507468.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/16138bec1b635d---wedafisipuzepi.pdfIn PDF document text
    • http://sro52.ru/uploads/files/lakomilagujavasil.pdfIn PDF document text
    • http://larben.cz/media/images/upload/file/gujeverabanevasas.pdfIn PDF document text
    • https://nyig.com/files/file/pefenovesusofasinixufaf.pdfIn PDF document text
    • http://nguyenxuanhuong.com/upload/files/39977121115.pdfIn PDF document text
    • http://gyn-ordi.at/myPix/file/21311629828.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/96076734781.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/8310584403.pdfIn PDF document text
    • http://titusauto.hu/kepek/file/bogeda.pdfIn PDF document text
    • https://krainaogrodow.eu/zdjecia/fck/file/923020453.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/3ade62bac76acbc52113dcc8770e0fc4/pasatijezarurimip.pdfIn PDF document text
    • https://ykitraders.com/UserFiles/file/rumapijalusuluv.pdfIn PDF document text
    • https://zlataraburmevuckovic.com/files/toxonamawuladikiwutil.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/xorerewizazegewajuteja.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/28369099850.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/68188725971.pdfIn PDF document text
    • http://quiltingacademy.info/fckeditor/userfiles/file/37766083975.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/ratojesadiwolajazim.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/92964107900.pdfIn PDF document text
    • http://snabsz.ru/ckfinder/userfiles/files/sunavibebexejubeda.pdfIn PDF document text
    • http://dogomanhnghia.com/uploads/files/30203181968.pdfIn PDF document text
    • http://www.ciesol.com/ckfinder/userfiles/files/14641604064.pdfIn PDF document text
    • https://srccaa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/68593391769.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/36208205031.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_off0000e832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE832 18204 bytes
SHA-256: 218d738215577e8076dc0d3ae73a95b0a4eee2c837b4bdc07e21785e38fea122
font_01_sfnt_off0001179b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1179B 10404 bytes
SHA-256: dcc7e58e17eeb43d61346debb474af7184988b7c679806b32680c3c27d739d02
font_02_sfnt_off00012f54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1