Malicious PDF — malware analysis report

Static analysis result for SHA-256 fff7287bb05cef66…

MALICIOUS

PDF

70.2 KB Created: 2021-09-25 20:30:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 179a47c27fd37a21307c4b168be7b1d9 SHA-1: ac74fea9ff4aa543d0e443f616d18d597d8a23f8 SHA-256: fff7287bb05cef669ca3347c4b39f350a83c955a358e257c4311b3c09bca1917
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external links, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or redirection scheme. Although no scripts were explicitly extracted, the PDF structure and embedded links are consistent with attempts to direct users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://cattaneoarchitetti.it/userfiles/files/vavulaxebufujelezulemad.pdf
    • https://apskarota.org/userfiles/file/rupolex.pdf
    • http://modnyi-buket.ru/uploads/files/jokaporepijepeteneluzuf.pdf
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e7c6f2560---35313345435.pdf
    • http://suvagcentr.ru/userfiles/files/76913246199.pdf
    • http://zeroseistudio.eu/userfiles/files/wariv.pdf
    • https://gencshow.com/upload/ckfinder/files/16214879916.pdf
    • http://teleinwestor.com/userfiles/file/motupizuvug.pdf
    • http://tcsm62.org/uploads/news/file/munomudukijowu.pdf
    • http://laiksmodalux.lt/app/webroot/uploads/userfiles/files/17009772411.pdf
    • http://frangarcia.eu/upload/file/158365329.pdf
    • https://vivaldiroberto.com/img/files/mediafiles/file/19026539982.pdf
    • http://kubablimel.pl/Image/files/21889444794.pdf
    • http://gongotour.com/FileData/ckfinder/files/20210913_1B5C224E434C33D9.pdf
    • http://youandisagenix.com/ckfinder/userfiles/files/vazilijomitapiwapuketav.pdf
    • http://vocal.bpv.su/content/files/files/37799650292.pdf
    • https://www.xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/27322373624.pdf
    • http://podlahyadvere.sk/editor_uploads/system/files/15617409329.pdf
    • http://aa-nusd.jp/vuseg.pdf
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/62489342068.pdf
    • https://thebillionbottom.com/business_school/uploads/file/fifisexizigukabapozosis.pdf
    • http://avandcie-energy.fr/ckfinder/userfiles/files/46915040972.pdf
    • http://thuexe7cho.vn/upload/files/moxekufusi.pdf
    • https://orrizon.ru/images/file/71793053570.pdf
    • http://gestioniarmatoriali.it/22378049337.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=tiny+kingdom+mod+apk
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b441.bin
dd55fc15863faa7ee739231477fe01961abc3340fc88ce5f9cd95d36a9756e40		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB441 15568 bytes
font_01_sfnt_off0000dbf0.bin
c456bc7bc4caf9d9bad1886abd7adefffa4136a4a2b5ecc4b0c2a29ee34df364		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF0 10360 bytes
font_02_sfnt_off0000f30f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF30F 16792 bytes

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