Malicious PDF — malware analysis report

Static analysis result for SHA-256 b967fb98414f183b…

MALICIOUS

PDF

70.1 KB Created: 2021-09-28 06:46:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1c60dfd109e669b94e506160510661e7 SHA-1: 1fd40bcb4115f8e1598702341ff317459a4898b5 SHA-256: b967fb98414f183b6dde3bf434d39927720c3905b252a52e46ea201727fda2d1
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by multiple heuristics as malicious, including PDF_RANDOM_URL_LINK and ML_NYX_PDF_MALICIOUS. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to distribute further malicious content or phish users. The ClamAV detection further confirms its malicious nature, identifying it as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://ambulatorioveterinariobubiniregini.eu/userfiles/files/paladurareti.pdf
    • https://incoyun.com/calisma2/files/uploads/68549001023.pdf
    • http://greentreeprep.com/cote_dor_import/admin/ckfinder/userfiles/files/jebukimovagomuramubab.pdf
    • http://around-sicily.net/userfiles/file/xikukemigodaluxufabitix.pdf
    • http://onsijsselstein.nl/userfiles/files/zodozulugoluju.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139cfbf6d283---domolujekipav.pdf
    • http://khyljg.com/uploadfiles/files/43297922044.pdf
    • https://habibitours.com/ckfinder/userfiles/files/lupakasejugu.pdf
    • http://mfcpavpos.ru/file/mimufosumigunadotupufuzur.pdf
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/mupaxar.pdf
    • http://retroldn.com/userfiles/file/2454911314.pdf
    • http://ohxto.com/uploaded_files/userfiles/files/37597303076.pdf
    • https://ruiguoex.com/upfile/files/2021/09/19/89585323240.pdf
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614729729e930---86048480627.pdf
    • http://gerocuki.hu/user/file/48910886618.pdf
    • http://agppi99.pretty-match.com/upload/files/dijasodorumoponerabumal.pdf
    • http://skonasystems.com/userfiles/file/teravedun.pdf
    • http://dostrojar.sk/UserFiles/file/97642943820.pdf
    • https://alihuata.com/userfiles/file/kanurirekenir.pdf
    • https://bomando.bomsolar.com/uploadfiles/files/16087984990.pdf
    • http://rootbeadmill.com/upload_fck/file/2021-9-18/20210918000928591742.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=smack+pain+game
    • 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_off0000b0b3.bin
cbecb0ecf9f3e4cade1b94ef6ca5ecac2c4ff8c05c3994f2fd2c18a80ff14409		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB0B3 10352 bytes
font_01_sfnt_off0000c80f.bin
afd5cdabe252ceb2d73e0df26ed913fd95c0ab0222b93a0b2a6bd82fad15ef9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC80F 16840 bytes
font_02_sfnt_off0000f31c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF31C 16792 bytes

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