Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2618b120352ae2c…

MALICIOUS

PDF

68.5 KB Created: 2021-09-26 23:52:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2f1479d599abee8cf912047f3313703d SHA-1: 901affa97dc93a2291868d97ef915456dbb2d8a3 SHA-256: d2618b120352ae2cfa7d546e0b1b7b0327e3f7d74e3f19fd95fa271057081af7
66 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by an ML classifier with high confidence. It contains numerous embedded URLs pointing to a link farm, suggesting a tactic to manipulate search engine results or distribute further malicious content. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically indicates this behavior, with many distinct hosts and UTM parameters used in the URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 4

  • 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://coluer.ir/documents/file/dolikatagujalipofusoj.pdf In PDF document text
    • http://abwninemile.com/uploads/files/gemula.pdfIn PDF document text
    • http://crystaltrade.hu/data/file/gizumobo.pdfIn PDF document text
    • https://armour-technoz-ca.otzol.net/ckfinder/userfiles/files/54550821722.pdfIn PDF document text
    • http://plenaseguroseprevidencia.com/fotosempresa/files/padim.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/93001095747.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/83307770157.pdfIn PDF document text
    • https://nexapos.com/upload/files/9969706035.pdfIn PDF document text
    • http://www.village-gaulois.org/gestion/ckfinder/userfiles/files/tigitofabavowiteritub.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/70449772949.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/95138492004.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe58f286df---84784155255.pdfIn PDF document text
    • https://songhong.info/userfiles/file/29339235913.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/dazafebadobapekazif.pdfIn PDF document text
    • https://hbphoto.ca/resimler/files/funomizaranaroguxuraw.pdfIn PDF document text
    • http://iraneto.com/basefile/iranetocom/files/25488391310.pdfIn PDF document text
    • http://space-edge.com/upload/files/xotibikopiratawudorome.pdfIn PDF document text
    • http://ahchala.com/img/file/52294340207.pdfIn PDF document text
    • http://pass38.com/images/contentimages/files/90527005237.pdfIn PDF document text
    • https://www.hmgfinance.com/ckfinder/userfiles/files/fifevaxemi.pdfIn PDF document text
    • http://seychelles-resort.com/images/blog/file/jalogemuvefot.pdfIn PDF document text
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/14728102899.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/vibotarenapar.pdfIn PDF document text
    • http://xinge168.com/uploads/files/20210925235333_400929.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/sodefebatevozoforikuzu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=todo+android+appsPDF 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_off0000afdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFDB 10072 bytes
SHA-256: ae8adc5a4a6747c85ba5446fd52c7c55e4788ebf67fb9e0363e4154ad5f1c62c
font_01_sfnt_off0000c646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC646 15380 bytes
SHA-256: 395eaaf5d742e44360e924130971295845ac96a5057d0fffa3c636a05075b209
font_02_sfnt_off0000ecd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1