Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2dbeff830f13c01…

MALICIOUS

PDF

69.3 KB Created: 2021-03-17 22:30:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: ce7e92df42d7475bddcfa1bcfec6df27 SHA-1: dd968d42a3b6ed3ef1f2e0589d86c24f234cd760 SHA-256: c2dbeff830f13c01210c8db7ccf76713e01edb90c73788b671c6358f450ba1b4
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating it likely contains malicious content. The document body, though heavily obfuscated, references "Krugman and wells microeconomics in modules 3rd edition" and the file was generated by wkhtmltopdf, suggesting a lure to disguise malicious links. Numerous external URIs were extracted, many hosted on disposable domains, pointing towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://dafemum.ru/aws?utm_term=krugman+and+wells+microeconomics+in+modules+3rd+edition PDF link annotation
    • https://cdn.sqhk.co/gituridewo/eH6jfgf/car_running_boards.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372963/normal_5ffc0f2c71a7e.pdfIn PDF document text
    • https://cdn.sqhk.co/sebutarukaw/X2apmic/78371046028.pdfIn PDF document text
    • http://tufodudem.mypressonline.com/26070577927.pdfIn PDF document text
    • https://pevivifigevesiw.weebly.com/uploads/1/3/5/3/135315965/2967220.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480162/normal_602525765ce1d.pdfIn PDF document text
    • https://cdn.sqhk.co/kunimanujage/bdicjdd/palorafisozabizulem.pdfIn PDF document text
    • https://welajewovire.weebly.com/uploads/1/3/3/9/133999455/nowene.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371244/normal_5fe0206cbf0ef.pdfIn PDF document text
    • http://fulukegoror.getenjoyment.net/the_egyptian_museum_cairo_official_catalogue.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377377/normal_5fe6f2414d27e.pdfIn PDF document text
    • https://cdn.sqhk.co/juvebuzizej/hbagmVD/elements_definition_science.pdfIn PDF document text
    • https://sowozulame.weebly.com/uploads/1/3/4/7/134733070/zedovedunurilig.pdfIn PDF document text
    • http://valigulepi.scienceontheweb.net/frederick_copleston_history_of_philosophy_set.pdfIn PDF document text
    • https://zogininofifus.weebly.com/uploads/1/3/2/6/132695288/3306990.pdfIn PDF document text
    • https://kuxijixa.weebly.com/uploads/1/3/4/8/134856984/169c10.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406168/normal_5ff350bce0b08.pdfIn PDF document text
    • https://lexilovomab.weebly.com/uploads/1/3/1/4/131452944/vemutaga-dapufupuxakokis.pdfIn PDF document text
    • http://nasufulorejuwe.mywebcommunity.org/20022609918.pdfIn PDF document text
    • https://juregirezixo.weebly.com/uploads/1/3/4/4/134401856/lenazejokotaraw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b39a0fbe-3b16-4a01-b71e-ec61392347fa/xuvamuvefigi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5420868e-9b0b-4090-a90f-2262bad9db30/99075976236.pdfIn PDF document text
    • http://vogapodidojuguf.myartsonline.com/sonorexezugiruvo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a90c28c-a107-40c0-ae8f-d9faca53508c/55640333386.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/862e6c16-5462-4629-afa3-b753b50f0f24/43078996349.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_off0000cf75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF75 5484 bytes
SHA-256: 5018b109f663bb65b27f3f8169f1aedf6284ab360aa6898a5fed7e152a17c8fa
font_01_sfnt_off0000e220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE220 10224 bytes
SHA-256: 98049e2108c5997c210c953fdba47917a74527fd02a47ec9cf6f53e5eee336f5