Malicious PDF — malware analysis report

Static analysis result for SHA-256 26398940c1ded736…

MALICIOUS

PDF

82.0 KB Created: 2021-09-15 19:48:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4b7f46717afc415382438ed5360428c6 SHA-1: c06895d32601f6f4447c38bba2bc44a27da907f9 SHA-256: 26398940c1ded73666c1d7dc6548f3447dd3cba046d4040c4e061af9713c2151
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically flagged as 'Pdf.Phishing.Trojan'. It contains numerous external URIs and is identified as a link farm on disposable hosting, indicating a phishing or redirection attempt. The PDF structure itself does not contain executable scripts, but the embedded links are the primary mechanism for directing users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://philabc.ru/uplcv?utm_term=checking+data+usage+on+android PDF link annotation
    • https://alstar.uz/images/shared/file/39989619492.pdfIn PDF document text
    • https://bimore.vn/webroot/img/files/32251735624.pdfIn PDF document text
    • http://ugrctrani.it/userfiles/files/refotorutujilonum.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/75025759727.pdfIn PDF document text
    • http://ingatlanfelugyelet.hu/uploads/file/86017461489.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/6306751203.pdfIn PDF document text
    • http://cuoredicane.it/userfiles/files/37459852103.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/59963716015.pdfIn PDF document text
    • http://artdental.hu/editor_up/40415387569.pdfIn PDF document text
    • http://bakersfield.thepokeluau.com/uploads/files/76415679906.pdfIn PDF document text
    • http://elvirajogsi.hu/ckfinder/userfiles/files/kelufupizuzofozudiko.pdfIn PDF document text
    • http://zonweringbelgie.eu/ckfinder/userfiles/files/78694674313.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/oo7p8dli8atnri1uvkqakh6ic0/baxobamedovulijudabo.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/revatalesinidefitosaba.pdfIn PDF document text
    • https://aristi-trap.com/upload/users/files/21894358218.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/pibal.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/sozekekigovamubikolosut1631488644.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/rojofu.pdfIn PDF document text
    • http://embody.box8websites.com/ckfinder/userfiles/files/84668833046.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613acb04c1f9e---9537816522.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/58132762932.pdfIn PDF document text
    • https://zzwgjx.com/d/files/wixupaxuwe.pdfIn PDF document text
    • http://siripanyalamphun.com/user_img/files/derijaxoto.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210909165823.pdfIn PDF document text
    • http://fotosvatba.net/userfiles/file/batukabunox.pdfIn PDF document text
    • http://tpfish.com.taipei/archive/upload/files/gividosutopavunal.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_off0000d8dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F4 10824 bytes
SHA-256: 99e79990b8b9996a86f752075c85a2bed9e4cb339734396dfc7cfcff2006705d
font_02_sfnt_off000109ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109BA 18668 bytes
SHA-256: 157de1409cdbff5a610343e304501267c3c9ac65e80ab56f9e903e3960bd7bea

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