Malicious PDF — malware analysis report

Static analysis result for SHA-256 afa6c853dec6ff3a…

MALICIOUS

PDF

84.7 KB Created: 2021-09-20 15:07:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a3f43bfb8308754677274edbba12fa17 SHA-1: 01323e3fc12d204498ed5db94e0daf7455c9d242 SHA-256: afa6c853dec6ff3a45a46639e9bcb2fc211c365aa2945337332b7d04d2465626
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and is described as a link farm on disposable hosting, suggesting it's designed to redirect users to potentially harmful sites. While no scripts were explicitly extracted, the PDF structure and numerous URLs point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://oniceh.ru/uplcv?utm_term=black+gospel+ringtones+for+android+phones PDF link annotation
    • http://jplus-ag.com/upload/files/BodyFile__613ECFE5070D2.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/bagazuwakuludixegi.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/xusesi.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/28085944341.pdfIn PDF document text
    • https://rheinfurth.de/userfiles/file/11634765483.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/vimubelerixojurata.pdfIn PDF document text
    • http://ipsgroupjjn.org/userfiles/file/92721038015.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc9f15066e---63414559043.pdfIn PDF document text
    • http://trustycctv.com/ckfinder/userfiles/files/66201651673.pdfIn PDF document text
    • http://rigosarchitects.gr/userfiles/file/lozegelimodo.pdfIn PDF document text
    • http://sun-eko.eu/files/file/xujoputetekagini.pdfIn PDF document text
    • https://konchris.com/userfiles/file/1631361596.pdfIn PDF document text
    • https://hoongnau.com/upload/files/zetufakepokesugiki.pdfIn PDF document text
    • http://americandeliorder.com/uploads/files/juzomuludi.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/33142186067.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/acdbd5d5bda098c1141ac269e1336cdf/94841891952.pdfIn PDF document text
    • https://duel.pl/userfiles/file/93747548663.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/54696599660.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/fifekemudapagu.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/lusipigifakawigib.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/tilowivujud.pdfIn PDF document text
    • http://vin-baietii.ro/ckfinder/userfiles/files/pilesokowixivomimemur.pdfIn PDF document text
    • https://afgventuregroup.com/cfiles/file/fomomedumufap.pdfIn PDF document text
    • http://landroverbh.com/ckfinder/userfiles/files/viviladudenixo.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_off0000e59c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE59C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fdae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAE 17656 bytes
SHA-256: 27add4c6e1d146fabf43967eca10f913a5adbf454071b36feb120c8a5e0ad8f7
font_02_sfnt_off00012bf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BF0 11044 bytes
SHA-256: a239161249fc85181be96ebee4c94edf4ac6d0e8f7831514b25cd10996462bcd

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