Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcb9a778088c957f…

MALICIOUS

PDF

67.3 KB Created: 2021-03-05 17:11:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 2a4062c13b326f2b5c8f4a85178b6973 SHA-1: e2c5aee96308b0b36bb04e10e130b37356feb118 SHA-256: fcb9a778088c957f92a70410acccb846f699b76df8a4008ed4177c54d34e2a51
134 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, suggesting a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of external URIs and the overall structure point towards a malicious document designed to trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://maypoin.ru/wix?keyword=thunderbird+500+manual+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4486981/normal_5fd7864a714dd.pdfIn PDF document text
    • http://jinevul.mygamesonline.org/how_to_troubleshoot_remote_start.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379855/normal_5ff59ec8d69ca.pdfIn PDF document text
    • https://cdn.sqhk.co/mezutorixo/VktQ4zq/idle_digging_tycoon_mod_apk_unlimited_everything.pdfIn PDF document text
    • http://gifinibufenatar.medianewsonline.com/what_kind_of_oil_to_put_in_honda_pressure_washer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461250/normal_5fd888cc2038d.pdfIn PDF document text
    • https://cdn.sqhk.co/xuwadezab/B5ghaic/75800924269.pdfIn PDF document text
    • http://koxelovanalimu.getenjoyment.net/21213713620.pdfIn PDF document text
    • http://paselon.getenjoyment.net/58277384498.pdfIn PDF document text
    • https://cdn.sqhk.co/lisakopew/UHijdY1/bipalekixetapuduzosonaf.pdfIn PDF document text
    • https://cdn.sqhk.co/lilovenodi/ZjibmK9/dunkin_donuts_menu_prices_munchkins.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474723/normal_602830a81fc4a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447640/normal_6039d5879e6fa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1416a32c-f91c-4ec3-9c10-bfdf610c7df7.filesusr.com/ugd/76de1a_09dff06d615643f9aa4c9284be7a31b5.pdf?index=trueIn PDF document text
    • https://68358877-4ee6-4e53-94f7-4bd9665c1f53.filesusr.com/ugd/3bbd68_53dba8d20c984ec4b493c5e3140ff441.pdf?index=trueIn PDF document text
    • http://laburebimefifal.epizy.com/fitbit_versa_lite_reviews_australia.pdfIn PDF document text
    • http://mojofukiw.epizy.com/allan_gray_money_market_fund_application_form.pdfIn PDF document text
    • http://gixiluvigatekij.atwebpages.com/are_dunkin_donuts_breakfast_sandwiches_good.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_off0000cc3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC3B 5456 bytes
SHA-256: a90caca1ecb52826babb5f9c25db98ed27fecbf1a8da0ee2c943367ab817382f
font_01_sfnt_off0000de95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE95 9828 bytes
SHA-256: ad572c4b9f839c571f4d581c17a34d0acd23aded2834cdeab671cf0caf4b37c2

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