Malicious PDF — malware analysis report

Static analysis result for SHA-256 270e3dfdac37ad42…

MALICIOUS

PDF

84.9 KB Created: 2021-04-03 23:30:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 114f2f2d11daf794b7bf6d793a378623 SHA-1: 285b7bd3e8d744ffc82e65fd3a6e4972dfbb578a SHA-256: 270e3dfdac37ad420dc698b489b6efb54f4db06e6c881c9779353a299abfc0f3
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm designed to host malicious content or phishing pages. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and numerous external links are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jacksth.ru/award?keyword=adjectival+and+adverbial+phrases+worksheet+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450350/normal_6026e48c9c3c3.pdfIn PDF document text
    • https://piwomokoxik.weebly.com/uploads/1/3/5/3/135335333/502365e4.pdfIn PDF document text
    • http://nutetuxiv.mygamesonline.org/vobitapidavarazodes.pdfIn PDF document text
    • http://jijomaj.getenjoyment.net/punjab_anti_corruption_establishment_rules_1985.pdfIn PDF document text
    • http://berasowugixo.mywebcommunity.org/59084898197.pdfIn PDF document text
    • https://vuguzakinizole.weebly.com/uploads/1/3/4/4/134493236/taduxabosivigex-fivazijodiwo-mepas-riwasusokax.pdfIn PDF document text
    • https://vutuwoti.weebly.com/uploads/1/3/4/7/134720014/deguximula_merezikavisofa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426407/normal_5fcd5dff2fca3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365547/normal_5fed554c21dd1.pdfIn PDF document text
    • http://zopokujejisolan.getenjoyment.net/66896086077.pdfIn PDF document text
    • https://boxusuvibirux.weebly.com/uploads/1/3/5/3/135308560/9388932.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370074/normal_6052202f6d577.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465015/normal_6064739fa76df.pdfIn PDF document text
    • http://kalowodopole.mygamesonline.org/marketing_plan_2020.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pipaneku/what_is_the_lesson_in_the_gingerbread_man.pdfIn PDF document text
    • https://4bc473c2-84d0-4913-8b4e-281bf44fba2e.filesusr.com/ugd/a25dbd_a707531cb8c7498784755c86107fcdbb.pdf?index=trueIn PDF document text
    • https://736f3f86-ac4a-4d06-be6b-3320275ea8ee.filesusr.com/ugd/cd27d0_e3da9d6e7c4e4af0b2e4a4d87bddcc1b.pdf?index=trueIn PDF document text
    • https://d99d9bf7-a5e0-49f2-90ac-0d1bc881463d.filesusr.com/ugd/0182ef_23e38ff8fb304a168205e50289196f1d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kozewuposoridil/femoxilovelalegeverojol.pdfIn PDF document text
    • https://s3.amazonaws.com/lerezazo/dafimuvunusofewemufip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecbcc786-7b01-448d-9613-e82f0aa0ccee/atomic_structure_worksheet_answers_fill_in_the_blanks.pdfIn PDF document text
    • https://3c2b787d-8465-4662-bdcc-bf736d584291.filesusr.com/ugd/8760e7_4060f73ba6df409691ec2bd00d9834c3.pdf?index=trueIn PDF document text
    • https://ebba3e40-d49f-4cc8-b137-373bb1124918.filesusr.com/ugd/384ea4_030928afee784087a276fd62683af7df.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/belopudevuzuza/security_newsletter_templates_word.pdfIn PDF document text
    • https://s3.amazonaws.com/pidufozu/little_prince_quotes_in_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55194f47-5951-4b27-8f7e-5f3f1adcf2bc/35576817741.pdfIn PDF document text
    • 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://scripts.sil.org/OFLIn 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_off0000f53c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53C 5664 bytes
SHA-256: 16ecdc80fed0a54d51cea78f81b78bb8bcfcfea700f873ca16006cbf1fad9f0b
font_01_sfnt_off0001088e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1088E 11848 bytes
SHA-256: cd606251c84cabe2aa881efa81f62ec13aa2ae767cd3ca5ba89e21fe9e328446
font_02_sfnt_off00013077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13077 16104 bytes
SHA-256: 1eb1a67c1e28174fcd3182c8c51ea08124a48e64646cffb6854bb4c979508c4a

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