Malicious PDF — malware analysis report

Static analysis result for SHA-256 77c18cb92c1b21b6…

MALICIOUS

PDF

70.2 KB Created: 2021-09-26 21:05:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 5f784ab05d110b4431059e7fcfecd264 SHA-1: 1d5692983c86209fe114185a9b7c67e467053c7a SHA-256: 77c18cb92c1b21b691d37524398eeba2023cc27c08b65dfe46549caf9ba45523
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, many pointing to disposable hosting, and is identified as a link farm. The presence of external URIs suggests an attempt to redirect the user to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • 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.
  • 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=notification+sounds+for+android+download PDF link annotation
    • http://xn--80aer5aza.xn--c1acndkmcarx.xn--p1ai/ckfinder/userfiles/files/45848770255.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/47245199287.pdfIn PDF document text
    • https://garnet-medical.com/userfiles/files/kapugijokifaxifewul.pdfIn PDF document text
    • https://penmypoem.com/new/admin/uploadfiles/file/81016981378.pdfIn PDF document text
    • http://worldtile.net/jangheung/userfiles/file/85260700308.pdfIn PDF document text
    • https://unchiulmihai.ro/files/fckeditor/file/sejusofetatavev.pdfIn PDF document text
    • https://xn--fiqa735be48e.com/upload/files/xeleberetelaguwe.pdfIn PDF document text
    • http://ch-bovi.com/upload/files/8019915814.pdfIn PDF document text
    • http://mylead-journey.mandiricareer.net/contents/files/3900460077.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/wikuwilurapikuxufufutexux.pdfIn PDF document text
    • https://aokman-drive.com/d/files/36352608003.pdfIn PDF document text
    • http://skncn.com/u/files/57215317244.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/kijafezokali.pdfIn PDF document text
    • http://misterholidaysanprisco.it/userfiles/files/wivefaxade.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/85493267567.pdfIn PDF document text
    • https://seeyounow.net/userfiles/file/78396587615.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146257452a13---28047758516.pdfIn PDF document text
    • https://seger.cz/userfiles/file/vosanogabukekamagozaribad.pdfIn PDF document text
    • http://islaminkiel.de/webmisr/uploadwebmisr/file/musetovesikat.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/27522300045.pdfIn PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/zaluguwigoviluzoxobejik.pdfIn PDF document text
    • http://elliptical-trainers.ru/ckfinder/userfiles/files/fewafunowi.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/nonewizan.pdfIn PDF document text
    • http://hoinhikhoavn.com/img/files/13790196523.pdfIn PDF document text
    • http://s292376414.onlinehome.fr/datas/imgmail/file/vavatozilibewive.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_off0000b067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB067 17108 bytes
SHA-256: ba5d14637aa33f83ae41c8eb4a1eccab9a54e82c49abbb7d371f3e2cab9dcc86
font_01_sfnt_off0000db24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f33b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33B 10500 bytes
SHA-256: 12977868adbbc7fd5fd34cd09aea1985f50003d6da4270297980f9e3ed75a61b

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