Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbdcba91da782d74…

MALICIOUS

PDF

86.9 KB Created: 2021-09-09 11:18:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 7d0a34139f27f5240a88e56ffc55d1e2 SHA-1: 019005e3e26cb3b855ba89b019ae09f4d78a036b SHA-256: dbdcba91da782d74f02cac8a8b38a939efdb5a4bad26601eb9127cf859ca60e1
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure and URL patterns are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://hopadive.cz/ckfinder/userfiles/files/jawobuxubevidotagas.pdf In PDF document text
    • https://olterus.org/contents/files/98642331395.pdfIn PDF document text
    • http://www.de.ruben.pl/ckfinder/userfiles/files/89997163638.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/laxemajobenemivok.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/vuvaxejegusupivamizilak.pdfIn PDF document text
    • http://glampingcaravan.com/userfiles/file/20210903050317.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/gefudamakubunul.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/jozutovuwukedivolegiduju.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/fitisizogomidulonufatuvi.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613165720411c---raxasesivu.pdfIn PDF document text
    • http://saigonford3s.com/uploads/2021-09-05/images/files/pukudiwuratu.pdfIn PDF document text
    • http://idevicesplus.nl/app/webroot/files/userfiles/files/guvumawasuxezejubabosu.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/ligej.pdfIn PDF document text
    • http://salman-group.com/userfiles/file/guwavose.pdfIn PDF document text
    • https://stthomasorthodoxchurchsouthpampady.com/userfiles/file/48098395305.pdfIn PDF document text
    • http://vipdiler.ru/files/file/vexideribiwe.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/68797012937.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/gavevikesagisomotusujif.pdfIn PDF document text
    • http://aldobini.it/userfiles/files/sodupidijakatirejukenotok.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132df26e6a79---82298917074.pdfIn PDF document text
    • https://cryptobasics.biz/uploads/files/pazafepepam.pdfIn PDF document text
    • http://ijfbn.com/editor_up/fosemimomu.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021090623554899.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/41702581082.pdfIn PDF document text
    • https://classoft.ro/userfiles/file/vefiko.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/zemumimidewo.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/398609505.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=enregistrer+conversation+t%C3%A9l%C3%A9phonique+android+samsungPDF link annotation
    • 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_off0000e73f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE73F 11412 bytes
SHA-256: 9d6eb4b1d518031c2d01fd2e0f4452fe6a93398c40dfaf511f0dee4332faf023
font_01_sfnt_off0001011e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011E 19376 bytes
SHA-256: 0d99abdff2f38592a2d2a557af5171765eb6c1b75c484200dc9ffe1dcf54ee74
font_02_sfnt_off00013224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13224 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.