Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ac7a3b1cbe3272f…

MALICIOUS

PDF

70.6 KB Created: 2021-09-29 10:16:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3c1b4d16bf4a2216483900fdad3632b1 SHA-1: e2d4a1ece40c9e3f07e7adcf567c820535df01bb SHA-256: 4ac7a3b1cbe3272fca383886aa0df0115f8716c7cac4672a9a8706dddf4cf450
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 embedded URLs, many pointing to disposable hosting, and is described as a link farm. The presence of external URIs and the overall structure suggest an attempt to direct users to malicious sites, likely for phishing or further malware delivery.

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://allytemp.ru/uplcv?utm_term=how+do+i+move+files+from+my+phone+to+my+computer PDF link annotation
    • http://tribo.kz/userfiles/File/38932901955.pdfIn PDF document text
    • https://perfecthospitals.org/ckfinder/userfiles/files/19511385430.pdfIn PDF document text
    • https://szallas-karpatalja.hu/upload/34155746288.pdfIn PDF document text
    • https://zaragozadenoche.es/upload/files/besereduxigakonav.pdfIn PDF document text
    • http://teamtrinity.net/trinitya/file/gowakufipujojejonitak.pdfIn PDF document text
    • https://ijp2.com/contents/files/16236327187.pdfIn PDF document text
    • https://mimpiindah88.com/contents/files/55341407627.pdfIn PDF document text
    • http://rubella2.integra-sh.com/userfiles/file/xejopojos.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/430669035.pdfIn PDF document text
    • http://cuahuyhoang.com/media/ftp/file/69748569424.pdfIn PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/23008916375.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/zevamomo.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613750b080e16---waritujalox.pdfIn PDF document text
    • http://www.ocptecnology.com/admin/uploaded/fck/file/wiwiwelu.pdfIn PDF document text
    • http://fcvperu.org/data/fcvperu/userfiles/file/zijizawidalufonepozufu.pdfIn PDF document text
    • http://hypotekaprezamestnancov.sk/res/file/99461882710.pdfIn PDF document text
    • http://artbaget.net/admin/ckfinder/userfiles/files/lurevem.pdfIn PDF document text
    • http://iwayman.com/uploadfiles/file/210928083600380598ufeis2.pdfIn PDF document text
    • http://sun-tes.ru/files/file/magino.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/delixotuxeremaz.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/16179608983.pdfIn PDF document text
    • http://89928386.com/uploads/files/202109021052007005.pdfIn PDF document text
    • http://raovat.coi.vn/uploads/userfiles/file/28123716584.pdfIn PDF document text
    • https://malabarmail.com/ckfinder/userfiles/files/65307992746.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_off0000aefb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEFB 17156 bytes
SHA-256: 075f3a172dedbbcdee800e980e9e6b3aa01ac390ce655e3342cf63af769e574b
font_01_sfnt_off0000daf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF310 11080 bytes
SHA-256: 94766c1a0cadf86cb05eb22a363eb73cdf16bf9907aa3e6cfe4abdb078008da1

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