Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1c345a0af6cb3f4…

MALICIOUS

PDF

98.1 KB Created: 2021-02-27 09:58:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: eb6aa9ed722ad89f0ab81df4eac6e14b SHA-1: 97991b4638008972181a084869c274381fe022a5 SHA-256: c1c345a0af6cb3f4f340916a6e7d516b9d1b4d04e2ba5bfe322519382e9235e5
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with many pointing to disposable domains and forming a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or directing users to malicious sites. While no scripts were explicitly extracted, the PDF structure and URL distribution are characteristic of a lure document.

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://crophysi.ru/wix?keyword=mina+bissell+organoid PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4454436/normal_6004576ab6954.pdfIn PDF document text
    • http://xtina.online/do_you_really_win_money_on_family_feud5g9c6.pdfIn PDF document text
    • http://de-bewertung-id2842384.icu/mojerudoasotr.pdfIn PDF document text
    • http://bikelumonekodex.mygamesonline.org/86306711682.pdfIn PDF document text
    • http://pefiworawodud.mypressonline.com/16953863896.pdfIn PDF document text
    • http://miribut.mywebcommunity.org/wojoregigopisave.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382962/normal_6023c2542e9b9.pdfIn PDF document text
    • http://pimazisiperej.iblogger.org/13179617623.pdfIn PDF document text
    • https://cdn.sqhk.co/dexujagafir/boLKgik/exponential_idle_secret_achievements.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408853/normal_5ff9cea92caad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/gonasidupij/31934243513.pdfIn PDF document text
    • http://nukilaba.myartsonline.com/how_do_you_calculate_energy_efficiency_ratio.pdfIn PDF document text
    • http://tabifewegijip.epizy.com/different_forms_of_alternative_sources_of_energy.pdfIn PDF document text
    • https://s3.amazonaws.com/gapivegek/clustering_algorithms_tutorial.pdfIn PDF document text
    • http://nopugorib.onlinewebshop.net/tukako.pdfIn PDF document text
    • https://s3.amazonaws.com/donake/torch_browser_pc.pdfIn PDF document text
    • http://jabenesejamuji.rf.gd/travel_itinerary_template.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000124e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124E9 4848 bytes
SHA-256: 496da2694acdc5d4f8dc8e0e2c84c50345a0cbc122a273b12160dd91e15a5e23
font_01_sfnt_off00013558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13558 10200 bytes
SHA-256: e1c0b60c519fb0ecfcecdf3ce7ec42f61216aa922e6e9338dcac4ddabe97ea2a
font_02_sfnt_off00015864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15864 16088 bytes
SHA-256: a31bcf556e181db077c9b64db679e746f1af4c47e86886feaa6b1c1c5ec82d40
font_03_sfnt_off00016d24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D24 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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