Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cae36d083fb6f74…

MALICIOUS

PDF

76.1 KB Created: 2021-04-26 10:14:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9a8599a6945de0afa70d4d79160b3caf SHA-1: 453ed374eb693c675b78c5c837675ccc3a37c2aa SHA-256: 6cae36d083fb6f74c6932911cd6421e851eca4a695b1958d3581066977f64b64
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, and a specific URL that appears to be part of a phishing lure related to translation services. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/strik?utm_term=traductor+frances+espa%25C3%25B1ol+en+linea+gratis
    • http://shoop-fh.ru/35528823774dacwa.pdf
    • https://static.s123-cdn-static.com/uploads/4417998/normal_5ff3cc217e53c.pdf
    • https://cdn-cms.f-static.net/uploads/4420034/normal_605d59bdcdfca.pdf
    • http://mavito.online/39760665545wlhne.pdf
    • https://cdn-cms.f-static.net/uploads/4428069/normal_604920f694638.pdf
    • https://cdn-cms.f-static.net/uploads/4408475/normal_6059a5f795b7b.pdf
    • https://static.s123-cdn-static.com/uploads/4486359/normal_5ff96e935155c.pdf
    • https://static.s123-cdn-static.com/uploads/4415327/normal_5fca43fc4ded8.pdf
    • http://fherixq.com/144961735957tg9v.pdf
    • https://cdn-cms.f-static.net/uploads/4474211/normal_6046fce100bce.pdf
    • https://cdn-cms.f-static.net/uploads/4371814/normal_6045ef4ed9fd4.pdf
    • http://daritibule.iblogger.org/fovitokuforebuvikofebore.pdf
    • http://electorat.org/what_is_rationalism_political_theory78l3i.pdf
    • http://myfirstsite.xyz/is_the_stock_market_open_on_july_398oc4.pdf
    • https://static.s123-cdn-static.com/uploads/4390659/normal_5fc84b54e7447.pdf
    • https://static.s123-cdn-static.com/uploads/4391907/normal_6003f06c863cf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://7e073981-ad1c-4081-8dc0-76946ba36063.filesusr.com/ugd/c4f63d_24162c9241c74f8b9352f5b87c1dfc13.pdf?index=true
    • https://58f604bd-1fd8-4cfe-af9b-f15e67d030d5.filesusr.com/ugd/9a7439_ba6d656ab1a04d648baca90f24f4ff46.pdf?index=true
    • http://xudazefujigi.rf.gd/acer_aspire_one_722_ddr3_memory_upgrade.pdf
    • https://1afae0f6-9e35-4dc9-9db7-5dbf78511926.filesusr.com/ugd/afe78f_c7553bfde6a149489be2cc2d39c14426.pdf?index=true
    • http://lokatetaf.rf.gd/zumukilikanitexadokew.pdf
    • http://vofefigekoloru.epizy.com/wojinum.pdf
    • http://somesituziki.epizy.com/pengo_arcade_game_free_for_android.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e650.bin
88e7e68d205c040fe49af04fe75d13a85e0c44a4071b08347e8f6a4a140e8b8b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE650 5484 bytes
font_01_sfnt_off0000f8c6.bin
c23a17d550d811207d7f68807aed2d885b0ea6b627d5e108c41a81bda38c9215		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C6 12592 bytes

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