Malicious PDF — malware analysis report

Static analysis result for SHA-256 78931c26433766c6…

MALICIOUS

PDF

68.4 KB Created: 2021-09-30 15:54:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 78a545b92bd874837250d6d29f9c57f1 SHA-1: 6b83fb344d0b5477d21ac147d7ee9f71b8c167a0 SHA-256: 78931c26433766c6ef8633bd9239ba211d3be6b1f2a6d7b6ec4d6293d287b19f
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. It contains numerous external URIs, many of which are part of a link farm hosted on disposable domains, indicating a strong likelihood of phishing or malware distribution. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://drafthe.ru/uplcv?utm_term=carrom+mod+app PDF link annotation
    • http://electriccityusa.com/images/fck_uploads/file/37014162940.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/69970374309.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-25/20210925143022584642.pdfIn PDF document text
    • http://mamitobe.ru/files/file/76009524118.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/20122397103.pdfIn PDF document text
    • http://marchmontnews.com/imgs/file/megimowuwofeku.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/pudagazupivex.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/45760708111.pdfIn PDF document text
    • https://jeneifogaszat.hu/cikkdata/files/tolevosivapalamuwuv.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/81613397922.pdfIn PDF document text
    • https://orangcar.com/app/webroot/upload/files/81685450176.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.com/filespath/files/20210916212532.pdfIn PDF document text
    • https://mr-alian.com/upload/ckfinder/files/bojuwosolojigowa.pdfIn PDF document text
    • http://cungcapluonech.com/upload/files/73839699035.pdfIn PDF document text
    • https://valubil.com/public/uploads/cms_file/cms_files/lanadaxadizapotajafalixaj.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/52428866654.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/tibesivavibeg.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613635c1bc5db---23176875384.pdfIn PDF document text
    • http://ototavandosemesi.com/resimler/file/28761594255.pdfIn PDF document text
    • https://xn--lenachatka-57b.pl/uploaded/file/mexotufu.pdfIn PDF document text
    • http://youil.org/userData/board/file/susejegowifakon.pdfIn PDF document text
    • https://otterdisplay.com/userfiles/file/5117760755.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/liliposabexopilajakog.pdfIn PDF document text
    • http://casms.org/atts/news-files/file/5988961056.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_off0000b149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB149 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c95b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC95B 14760 bytes
SHA-256: bd4d1b0519b021a523972545656c126beffdf4432bad3a50f715c161f7509a4d
font_02_sfnt_off0000ede8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE8 9944 bytes
SHA-256: 1f21bd6418c782610a6896d52386dbf8f2b72e211a489a5a2b315c67ad3007ef

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