Malicious PDF — malware analysis report

Static analysis result for SHA-256 7670c7d8c31cebc2…

MALICIOUS

PDF

72.0 KB Created: 2021-09-10 00:50:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 130040551965499dafc789c86eb04b23 SHA-1: f40280386fad97642e7fd7a0d31c94798f832c88 SHA-256: 7670c7d8c31cebc216be475bf3db341e204dfc7ecd109f92757c460e23c26402
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, suggesting the document's primary purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16131c47edb87c---54689617895.pdf In PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613013146d20c---7597140543.pdfIn PDF document text
    • http://www.itidharamshala.in/images/uploads/files/92847446027.pdfIn PDF document text
    • https://t-groupvnxkld.com/uploads/news_file/wasunobejode.pdfIn PDF document text
    • http://hadt.vn/upload/files/lonagi.pdfIn PDF document text
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/juwikewasixunapofiputom.pdfIn PDF document text
    • http://lamgi.pl/ckfinder/userfiles/files/xinujiwerav.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/37881484373.pdfIn PDF document text
    • http://nsk-nalogov.net/upload/files/nejaxizuku.pdfIn PDF document text
    • http://shouce-image.kuchuancdn.com/Public/resource/files/38411430280.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-2/20210902103434282618.pdfIn PDF document text
    • http://www.schule.havonix.com/ckfinder/userfiles/files/57294314090.pdfIn PDF document text
    • http://mlead.net/images/e/file/zirukaraj.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021090414530273499.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/dakagasibufatixefajakom.pdfIn PDF document text
    • https://spitalmoldovanoua.ro/ckfinder/userfiles/files/kimukopoduroporitefu.pdfIn PDF document text
    • http://cualuoiskydoor.com/webroot/img/files/gufopudif.pdfIn PDF document text
    • https://b7b.reviewz.eu/app/webroot/files/userfiles/files/37034691291.pdfIn PDF document text
    • http://studiomistretta.com/userfiles/files/10523708435.pdfIn PDF document text
    • http://ap116.ru/userfiles/file/papuxig.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/suvinexapadevozixawi.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/45075201595.pdfIn PDF document text
    • http://vhshf.de/File/bimimixasujanawiguzide.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=madea+meet+the+browns+play+123moviesPDF 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_off0000b66a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB66A 16124 bytes
SHA-256: 97b239d3dee9576ac93b851621ae4df285bc23e02f675c7445b64a18382cab9d
font_01_sfnt_off0000e016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE016 11400 bytes
SHA-256: e9448649c49a2a9c1845ea741fa48bec2bffc65dc71009a1fbcd9b2352361eb0
font_02_sfnt_off0000fab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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