Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c80908cde6439ca…

MALICIOUS

PDF

69.3 KB Created: 2021-09-25 01:00:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a80dc8a4898b8f8d557939c6226a6fe3 SHA-1: a835b7c47c6db32a00f552e7b4e3fd6e9089b483 SHA-256: 3c80908cde6439ca9b046affb2c967f763c0ebeeb9c1e4f6e5cfdf618b945552
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the presence of embedded URLs and the overall structure suggest the PDF is intended to redirect users to potentially harmful websites, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://oniceh.ru/uplcv?utm_term=mechanical+engineering+apps+for+android PDF link annotation
    • http://weingut-suppan.at/files/71863973520.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/69581333054.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/jotirawevaxediwutaved.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/93369978006.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/89454256725.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/29973678097.pdfIn PDF document text
    • http://stillincontact.com/images/mails/file/56303103365.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/77635822927.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/35588653504.pdfIn PDF document text
    • https://aspit.ro/imagini_ws/zixalabewa.pdfIn PDF document text
    • http://vietnam-intraco.com/webroot/img/files/60367332442.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16142957c0631a---95497731562.pdfIn PDF document text
    • http://open.ua/uploads/ckeditor/files/momamuxajisi.pdfIn PDF document text
    • http://nb-magnet.com/upload/files/bilonemuzobaz.pdfIn PDF document text
    • http://ivankrivanek.com/userfiles/file/toworuleguvuw.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/96438499097.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/nudevezab.pdfIn PDF document text
    • https://korvioinfotech.com/ckfinder/userfiles/files/51516157536.pdfIn PDF document text
    • http://blueyee.com/upload/file/211004009514.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/83861649611.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/jexuzirozakeg.pdfIn PDF document text
    • http://www.phuongdonggolf.vn/app/webroot/uploads/files/1895956831.pdfIn PDF document text
    • https://tes-sys.com/uploads/ckfinder/files/20210903/16306373949080.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_off0000b116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB116 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c92d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC92D 10792 bytes
SHA-256: f520a395ddc0daf5ccf3e24e9b7e9bb9aade74eaf1edcc3de6365bafa563fe7c
font_02_sfnt_off0000e1ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AB 15164 bytes
SHA-256: 0a9b52e527d25d6ce057715ef238d96c705d81b157116cb3277063c264509716

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