Malicious PDF — malware analysis report

Static analysis result for SHA-256 a12014528c39126a…

MALICIOUS

PDF

74.0 KB Created: 2021-09-16 09:00:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d231e76378030522075f6933e650bf96 SHA-1: 89ef76dce3c1db862d66244a19abc39d6df71b45 SHA-256: a12014528c39126a824f31f5bb642d8cbc092cfb8cf370bd81ce41dff3cf727d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to a link farm hosted on disposable domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 https://lacgl.org/upload/editor/file/12532935817.pdf In PDF document text
    • https://flyags.com/editorResources/file///80974788168.pdfIn PDF document text
    • https://jensbrode.de/files/file/99397722648.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/87004666161.pdfIn PDF document text
    • https://biographiewerkstatt-singer.de/userfiles/file/24914771379.pdfIn PDF document text
    • http://orthopediedelft.eu/files/pasadimemagiralowi.pdfIn PDF document text
    • http://tehnicgaz.eu/files/file/zapajaboru.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1613d96671fa52---69706475415.pdfIn PDF document text
    • http://rebizplus.com/userfiles/file/totisuvosezabidisatudadek.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/pivitufosa.pdfIn PDF document text
    • http://jmk.kr/ckfinder/userfiles/files/kanomi.pdfIn PDF document text
    • https://www.autopsrus.com/ckfinder/userfiles/files/17273397926.pdfIn PDF document text
    • http://prochem.vn/images/uploads/files/gizowadikufesak.pdfIn PDF document text
    • http://conelser.hu/fck_uploads/file/debev.pdfIn PDF document text
    • https://granitnet.hu/editor_up/nujoxafawosevosix.pdfIn PDF document text
    • https://highrise.pl/file/51012737830.pdfIn PDF document text
    • http://keemunblacktea.cn/uploads/file/040158097143.pdfIn PDF document text
    • https://tranthachcaodanang.com/uploads/image/files/lebunurofuwibugebasif.pdfIn PDF document text
    • https://jeanmarcrobion.fr/userfiles/file/zikateg.pdfIn PDF document text
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/pikikalomefesikovuzi.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/ho9oqcruhe0sdd0896oqm673b7/sunuwarapevafawegazik.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16140e9841fa34---73422064565.pdfIn PDF document text
    • https://polenhosting.com/calisma2/files/uploads/44384697994.pdfIn PDF document text
    • https://mekongtransport.com/upload/userfiles/files/tiregosijujenodumowa.pdfIn PDF document text
    • http://ktai.lmg.jp/upload/file/vojoxamuv.pdfIn PDF document text
    • http://ageddfjtj.pretty-match.com/upload/files/73901943039.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=mod+idle+construction+3dPDF 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_off0000bff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFF5 10464 bytes
SHA-256: 6c4531962e296935a5df1cacafcec15beaec0fead0715c6d1af4edf923595db9
font_01_sfnt_off0000d7d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D8 16604 bytes
SHA-256: 5c2d34e3ecfe6f18ee9bc22dd40203cfa1a5de0465f259eb4db4864eb7504208
font_02_sfnt_off00010291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10291 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1