Malicious PDF — malware analysis report

Static analysis result for SHA-256 1eef26aa3a2f86e4…

MALICIOUS

PDF

75.1 KB Created: 2021-04-01 14:09:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 335feb50b726900caca0b0cbcdd47e0a SHA-1: df06c5e7227a51925c2162d9aba5d2bcbdb81d40 SHA-256: 1eef26aa3a2f86e4c8ffd00c18f64db688f30811de7ab7e4ffe80b8db801d83a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with at least one pointing to a domain associated with phishing lures ('award' endpoint). The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further suggests a tactic to obscure malicious links within a large number of disposable domains. No scripts were extracted, but the presence of external URIs and the overall detection profile strongly suggest a phishing or malware distribution attempt.

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://xajibur.ru/award?keyword=mckinsey+company+presentation+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4426073/normal_5fffc106c03a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445733/normal_6056f8f7e50c6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477137/normal_5feb5a02cebc8.pdfIn PDF document text
    • http://dilawiputonu.mypressonline.com/adverbs_of_place_worksheets.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420586/normal_601facfe2a53f.pdfIn PDF document text
    • http://gosunenibunale.getenjoyment.net/cystitis_adalah.pdfIn PDF document text
    • http://ligugiban.scienceontheweb.net/16733556068.pdfIn PDF document text
    • http://memubalejegezur.66ghz.com/2952789937.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/jewizopukuni/gonugerapomuxenafirodoju.pdfIn PDF document text
    • http://kexeban.rf.gd/vavuxom.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/schlage_keyless_lock_battery_dead.pdfIn PDF document text
    • http://wimanusor.epizy.com/bhagavad_gita_chapter_18_in_english.pdfIn PDF document text
    • http://muzulozak.atwebpages.com/aleister_crowley_livro_da_lei.pdfIn PDF document text
    • http://sotexazonilot.rf.gd/messenger_for_android_version_5._0.pdfIn PDF document text
    • http://wefalojinon.rf.gd/barska_telescope_user_manual.pdfIn PDF document text
    • http://jafimogapevov.rf.gd/chrome_plugin_to_video_from_website.pdfIn PDF document text
    • http://solugivewatewa.myartsonline.com/loxawegasosibutijet.pdfIn PDF document text
    • http://muxobuduxude.epizy.com/dispensing_error_log_sheet.pdfIn PDF document text
    • http://puriruf.epizy.com/72313132797.pdfIn PDF document text
    • https://s3.amazonaws.com/wekibik/metexuz.pdfIn PDF document text
    • http://foxinojale.epizy.com/gowozatomis.pdfIn PDF document text
    • https://s3.amazonaws.com/piradi/film_budget_template_google_sheets.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_off0000e65b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE65B 5440 bytes
SHA-256: a32e5b97f79ca017f0fb2b5fefe9279b5c715b411bd9f5d6d573826418544680
font_01_sfnt_off0000f8de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DE 10692 bytes
SHA-256: 38a2db239465ba8be1befe6cb01fa3037df79301e153def6adceae043f25ed5c

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