Malicious PDF — malware analysis report

Static analysis result for SHA-256 41792b84eebcd82c…

MALICIOUS

PDF

85.5 KB Created: 2021-09-12 21:25:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 1bb34c498a34a1a0d8417f59e568a461 SHA-1: 396e9f1de17e479e05a8663d1763f6bb3578ab18 SHA-256: 41792b84eebcd82c011d8250c4e170abe33e26d7da0ddde71b2f91e7cdc40330
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, with one specifically identified as a link farm on disposable hosting, suggesting it's used for phishing or malware distribution. The presence of embedded URLs and the overall structure point towards an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://allytemp.ru/uplcv?utm_term=best+substratum+themes+for+android+10 PDF link annotation
    • http://xindeshiye.com/uploadfile/file///2021090815191138.pdfIn PDF document text
    • http://printrun.nl/userfiles/files/pigusupaki.pdfIn PDF document text
    • https://gizaviation.com/uploads/files/buzeboloduvumap.pdfIn PDF document text
    • http://kechengchem.com/upload/files/8785477138.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/tobovipiluwoxonajoda.pdfIn PDF document text
    • https://undergroundtakeout.com/userfiles/file/wuxawosogilerito.pdfIn PDF document text
    • https://frigosztufi.ro/ckfinder/userfiles/files/59941831740.pdfIn PDF document text
    • http://fotocaroli.it/userfiles/files/95289032985.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136121a5a3c0---wutaz.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/78540287438.pdfIn PDF document text
    • https://myagenda.myagenda.cz/pictures/editor/files/xupevasixelami.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/gufunolenap.pdfIn PDF document text
    • http://szybkieprawko.pl/szybkieprawko.pl/user/admin/fck/file/57744123605.pdfIn PDF document text
    • http://pho32shabu.com/uploads/files/barazuke.pdfIn PDF document text
    • http://com123.vn/uploads/file/58398827303.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/52737531546.pdfIn PDF document text
    • http://webinaris.eu/ckfinder/userfiles/publics/files/68881407822.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/guvukad.pdfIn PDF document text
    • https://geloracinta.com/contents/files/51864406553.pdfIn PDF document text
    • http://hissekurban.com/resimler/files/vavidikezobabuxu.pdfIn PDF document text
    • http://zuche0551.com/upload/file/belazid.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139b594f1f0f---42874494698.pdfIn PDF document text
    • http://n2nnetworks.com/files/others/30914823376.pdfIn PDF document text
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/1319265159.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_off0000e69e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE69E 18284 bytes
SHA-256: 850e09e95f5c0fd3d509bad47959707bd40124056447e47383839795548f21ee
font_01_sfnt_off0001164f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1164F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E66 11040 bytes
SHA-256: 87f0a40277a6d3302063af7221a8dc2b942a3e8bc875aab9a0a59d4f8abd624f

Open this report in the interactive analyzer, or submit your own file for analysis.