Malicious PDF — malware analysis report

Static analysis result for SHA-256 55dd4ead9d522f27…

MALICIOUS

PDF

85.6 KB Created: 2021-05-10 04:45:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7ddd3094a5a844dfb407f978d2b02252 SHA-1: c42bd74b7cce623de9065d0eee5060e2e4f38458 SHA-256: 55dd4ead9d522f27d3d85a1b675b63eb337dd03566d2c6cdff9ecb5e78fb8d38
96 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier returned a high probability of maliciousness. The document body contains a lure related to 'Geronimo Stilton books series 2' which directs the user to the URL https://jottigo.ru/strik. This URL is likely used to deliver a malicious payload or redirect to a phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://jottigo.ru/strik?utm_term=geronimo+stilton+books+series+2
    • https://cdn-cms.f-static.net/uploads/4486344/normal_606c3705b9b4e.pdf
    • https://cdn.sqhk.co/xudevekelefe/BRPrgi2/18551439487.pdf
    • https://cdn-cms.f-static.net/uploads/4402953/normal_6065cd52a0602.pdf
    • https://cdn-cms.f-static.net/uploads/4424985/normal_604348d79597f.pdf
    • http://gevenukodujojov.getenjoyment.net/daxagenamemabilexaz.pdf
    • https://cdn.sqhk.co/revowemerem/jdsy4z3/cat_ear_infection_treatment_over_the_counter.pdf
    • https://cdn-cms.f-static.net/uploads/4483103/normal_5fd84780d2daf.pdf
    • https://cdn-cms.f-static.net/uploads/4417222/normal_600be59f25cf1.pdf
    • https://cdn.sqhk.co/bexikerez/hiiejbP/munudaroturolupumewok.pdf
    • https://cdn.sqhk.co/bulixanejad/8unusyz/wokikasunitigoma.pdf
    • https://static.s123-cdn-static.com/uploads/4486534/normal_5fc926f5331bc.pdf
    • https://static.s123-cdn-static.com/uploads/4393503/normal_5ff9729867eb7.pdf
    • https://cdn-cms.f-static.net/uploads/4495999/normal_600b622e9ed2d.pdf
    • https://cdn-cms.f-static.net/uploads/4380230/normal_6056d1e214d6d.pdf
    • https://cdn-cms.f-static.net/uploads/4454419/normal_604ccc35a9de2.pdf
    • https://cdn-cms.f-static.net/uploads/4463552/normal_606912a4279c4.pdf
    • https://cdn-cms.f-static.net/uploads/4486200/normal_60342d8bae797.pdf
    • https://cdn.sqhk.co/budotedo/dflZbWa/medieval_war_strategy_games_online.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://kipejefanowisu.atwebpages.com/76124328037.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010589.bin
a32467a425823c7aaa3b7ec11ba6b0d1c935daca6911dfee569eae3cbb27990f
pdf-font-stream PDF embedded font (sfnt) at offset 0x10589 4776 bytes
font_01_sfnt_off000115a8.bin
7497ea9235a5401b68b33f53548de93abc48659cb7b76cc32d5e452f5e3b5140
pdf-font-stream PDF embedded font (sfnt) at offset 0x115A8 11256 bytes
font_02_sfnt_off00013b38.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B38 4324 bytes