Malicious PDF — malware analysis report

Static analysis result for SHA-256 050e670f2b03599e…

MALICIOUS

PDF

86.4 KB Created: 2021-09-19 21:51:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c08f296ecd89ed1944f7ccf3077d48a2 SHA-1: 4aec9c7f056da4a95e4cba55ea5105ae22d1bc3a SHA-256: 050e670f2b03599ef4ed2040abc1a291f93473e15ec728ba9c94abf5ad21e8d3
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of 'powershell.exe' in the document text hints at potential execution of commands, possibly to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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=how+to+install+android+app+in+windows+10 PDF link annotation
    • http://mbfeed.vn/upload/files/jokikutepuno.pdfIn PDF document text
    • https://dancleland.com/img/upload/file/puguj.pdfIn PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/77286086970.pdfIn PDF document text
    • http://nhasachthunam.com/upload/files/sujamufarulijegulikekazag.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/torakawojexedajufefe.pdfIn PDF document text
    • http://geofer.eu/userfiles/files/74727163475.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/96452068989.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/fatunesudinosokuruxiri.pdfIn PDF document text
    • http://5mal4.de/moneyvidya/web/images/userfiles/file/derelavemofig.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/71331850052.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16135694838e06---47690273639.pdfIn PDF document text
    • http://bangiyaparishadtoronto.ca/bpt/editor/uploadfiles/nosaribajane.pdfIn PDF document text
    • http://annabarons.com/files/files/18935293978.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210913_023120.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/it7qs5d94pdephrnlnk594r0t2/golafepogaduk.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mofurav.pdfIn PDF document text
    • https://valstybestarnyba.com/upckfinder/files/57354991804.pdfIn PDF document text
    • https://eprobatdz.com/ckfinder/userfiles/files/zagubufur.pdfIn PDF document text
    • http://www.aunay-sous-auneau.fr/ckfinder/userfiles/files/winenivigavawuvebu.pdfIn PDF document text
    • http://teplospectr.ru/images/files/9191275875.pdfIn PDF document text
    • https://morethancars.eu/uploads/edytor/file/61039110598.pdfIn PDF document text
    • https://smilaxlabs.com/userfiles/files/xegivezuditu.pdfIn PDF document text
    • https://www.hasmow.com.au/application/third_party/ckfinder/userfiles/files/41830483889.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_off0000e991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE991 10504 bytes
SHA-256: d351ed533cea94c1741d570d6e4d4bfa812a16da43a9e04238749680f411e0bc
font_01_sfnt_off00010195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10195 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A7 19188 bytes
SHA-256: 3fdca32a2157ee2c45c476b19467cf26759bca394a4914eb0cc922c487c46328