Malicious PDF — malware analysis report

Static analysis result for SHA-256 07457e3b388e6611…

MALICIOUS

PDF

66.6 KB Created: 2021-03-31 06:29:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: a07162ec08e45f18da15d55de491c604 SHA-1: bd7e4ab394c6d721dbdd49814555f6442bc9f350 SHA-256: 07457e3b388e6611ce36e99267cc6b602338f15928879fb3a95d1aa036aac117
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, and is flagged by ML classifiers and ClamAV as malicious phishing content. The document body, though heavily obfuscated, appears to contain metadata related to the file's creation and potentially a lure related to "Munson fluid mechanics 8th solutions". The presence of embedded URLs suggests an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 https://druttle.ru/strik?utm_term=munson+fluid+mechanics+8th+solutions PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4408481/normal_5fc6783930c34.pdfIn PDF document text
    • https://fugejifok.weebly.com/uploads/1/3/4/1/134132056/puduresilon.pdfIn PDF document text
    • https://cdn.sqhk.co/tirabipati/iUghDgg/76556515943.pdfIn PDF document text
    • https://vufixedita.weebly.com/uploads/1/3/4/8/134884828/zirufo_resemimowu_naxegavedu.pdfIn PDF document text
    • https://cdn.sqhk.co/sativomofij/mRggfjc/wwe_raw_latest_results_bleacher_report.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471230/normal_6038c4bb17c0b.pdfIn PDF document text
    • https://cdn.sqhk.co/wejagamewo/Whhhfvo/your_neighbourhood_credit_union_contact_number.pdfIn PDF document text
    • https://funopazotasar.weebly.com/uploads/1/3/1/0/131070342/a676b1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456989/normal_5fe5374a0a5e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367920/normal_6032f3a1cde58.pdfIn PDF document text
    • https://cdn.sqhk.co/vakusukereju/bhjjdA2/87701071138.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420030/normal_5ff59bdc29724.pdfIn PDF document text
    • https://tadesurirow.weebly.com/uploads/1/3/2/7/132711952/8781316.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387813/normal_5ffdaa440b902.pdfIn PDF document text
    • https://voderixata.weebly.com/uploads/1/3/4/2/134266977/bojoserip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408703/normal_6063abd0ae1a1.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/fokapikow/1821546229.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaduxa/gotuvanebokogepilutuzopex.pdfIn PDF document text
    • https://s3.amazonaws.com/fotojipifuzitul/fegesaxoluruwekunutuxon.pdfIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/household_budget_spreadsheet_template_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/vasofirida/filemaker_pro_13_user_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/sukedil/zelemedolopoj.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA10 5364 bytes
SHA-256: 540190b27a8a0b108fc3baa699026fe74b605f82f0639524709ef8a0ba0b1a84
font_01_sfnt_off0000dc32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC32 9600 bytes
SHA-256: 23b1bd8a3999eb22000da7e6552543763c61c3fcfb949e12843c6c3963b2d935

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