Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaaf97ca95ea63c5…

MALICIOUS

PDF

86.1 KB Created: 2021-09-22 11:17:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: df89df1864acea725a41bd56c4cd6110 SHA-1: d0c4b793a34a928c5095639e3bd744a65b94047f SHA-256: aaaf97ca95ea63c56ffb8c378d2f35149d4675f041fe7cbc6473f264895a3cc8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, hosting numerous external URIs on disposable domains, such as https://estoniapools.com/contents/files/nelupesajirivajetu.pdf. The embedded URLs are likely used to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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=onenote+android+phone PDF link annotation
    • https://estoniapools.com/contents/files/nelupesajirivajetu.pdfIn PDF document text
    • http://darstin.com/userfiles/files/43351061741.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/25502026348.pdfIn PDF document text
    • https://telechips.com/ckfinder/userfiles/files/29388759723.pdfIn PDF document text
    • http://ruishikaishi.com/upload/content/files/2021/09/20210907064517.pdfIn PDF document text
    • http://jindi2010.com/uploadfile/files/senudir.pdfIn PDF document text
    • http://manpukulivermore.com/uploads/files/rojuwubabedokuzenof.pdfIn PDF document text
    • http://vit-physio.de/file/14858526196.pdfIn PDF document text
    • http://tuvanthanhlapcongty.biz/upload/ck/files/nifot.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614acf023d93b---fagosinubisivezisezimo.pdfIn PDF document text
    • http://radioevangilereal.com/assets/ckfinder/core/connector/php/uploads/files/ziwevegudopomosigujamugav.pdfIn PDF document text
    • https://ceiling.holcom.vn/webroot/img/files/nakotanebaxu.pdfIn PDF document text
    • http://xn--2-140-swe8h.xn--p1ai/files/56241611297.pdfIn PDF document text
    • http://feuerwehr-mittenwalde.de/mediathek/files/japebetufojiropemamoker.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/gvnme121c4ch8duftb4f6gn289/60114423515.pdfIn PDF document text
    • http://maristaslardero.es/userfiles/file/vumugetewimoromar.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/49580463841.pdfIn PDF document text
    • http://bjjiffy.com/upload/62579705168.pdfIn PDF document text
    • http://orenprom.com/img/account/file/kagomakabepufadebevun.pdfIn PDF document text
    • http://dragonspond.com/uploads/files/guvatekowidisabup.pdfIn PDF document text
    • http://theorientgarden.iorderfoods.com/uploads/files/78436672796.pdfIn PDF document text
    • http://globalsocialwlefaresummit.com/app/webroot/uploads/ckuploads/files/54292861592.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_off0000ecf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF7 10300 bytes
SHA-256: 359bf578c79f076ebc2c9ea81dad211b3861429f46ab7bfa7f53ac7dbee5a582
font_01_sfnt_off0001040e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1040E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C20 17952 bytes
SHA-256: ca368fad6862e70b1efad4fcf7a3a22c3dca2f88870fec1593b600a788b8f580

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