Malicious PDF — malware analysis report

Static analysis result for SHA-256 935295ad51cb1888…

MALICIOUS

PDF

81.4 KB Created: 2021-09-18 12:03:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 05dd0955e0d1219b011dab128153042a SHA-1: 1c77a204caef68fef77a6e7faf163b08e2bba43d SHA-256: 935295ad51cb18880c4ad3d0e5e67e0dc11f2927edb9d8405b636c4f51971e11
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs pointing to disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded URLs are consistent with attempts to redirect users to malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://queure.ru/uplcv?utm_term=golden+dragon+apk+download PDF link annotation
    • http://mexvp.com/ckfinder/userfiles/files/kavexejibisafinux.pdfIn PDF document text
    • http://jyjjapan.jp/files/ckeditor/files/nokojorifufabi.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/witigeditoxagijonoxajomoz.pdfIn PDF document text
    • http://innovatepc.com/userfiles/file/fadivoriwinubimapej.pdfIn PDF document text
    • http://thongthien.vn/upload/files/17602644388.pdfIn PDF document text
    • http://93564497.com/userfiles/44978838945.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/28828009052.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/12792428584.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/xoravufodokigo.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/92715057769.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/5ee564819087de52275328ffefabe499/rovewobuvagikozajug.pdfIn PDF document text
    • https://horgaszvelem.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/90062072957.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/65402572186.pdfIn PDF document text
    • https://remont-bez-zabot.ru/files/file/birexoxaruxixubirokifi.pdfIn PDF document text
    • http://www.autoservis-hubatka.cz/admin/upload/ww/file/zobixoduwen.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161417ad5d8403---wavixufusis.pdfIn PDF document text
    • http://kccmaul.com/files/files/dutakatipozexafejasujokun.pdfIn PDF document text
    • http://kirakuramen.com/uploads/files/jalixigevutafugovidugu.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/88423934024.pdfIn PDF document text
    • http://zenithmetals.com/files/72407355077.pdfIn PDF document text
    • https://afritransport.com/app/webroot/files/file/guniviz.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_off0000d42a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD42A 20404 bytes
SHA-256: de84f34d5b87f2ba0cf748140b8d2bdff8c1761b418711ecefdb4be3e3b1ae27
font_01_sfnt_off0001084d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1084D 10428 bytes
SHA-256: 7a5ebb3e5903df0f05670c9cd2e92f7a75894144ae7f834849f15416ab16e145
font_02_sfnt_off00011fe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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