Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4188f62fed9a585…

MALICIOUS

PDF

81.3 KB Created: 2021-04-29 13:04:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 0a5407aefd234570d413c1d84088862b SHA-1: ee4aa12712ea6e5cf2f06043269357d561092ca3 SHA-256: c4188f62fed9a5855ec628bc6be06cb2291399cfce9a2b9a2f014281f0d578d3
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, many pointing to disposable hosting, and is flagged by ClamAV as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to obscure malicious links within a large number of seemingly unrelated documents. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/strik?utm_term=successful+time+management+for+dummies+pdf+free+download PDF link annotation
    • https://vuxilimibipemop.weebly.com/uploads/1/3/1/4/131453056/4a22e63ae505250.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376369/normal_60695ba2cc7a6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421944/normal_5fdf1c0199152.pdfIn PDF document text
    • https://cdn.sqhk.co/wagejino/ghggjgd/jujutumufaburute.pdfIn PDF document text
    • https://cdn.sqhk.co/kitujesijak/ihfghKe/69267136353.pdfIn PDF document text
    • https://cdn.sqhk.co/luwonopilil/jbeHiJQ/cornfield_chase_sheet_music.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368770/normal_5fc729ad26b58.pdfIn PDF document text
    • https://dexajaxalujum.weebly.com/uploads/1/3/1/8/131857565/865b1e5c9e351a.pdfIn PDF document text
    • https://bapixive.weebly.com/uploads/1/3/4/3/134393773/2997531.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414871/normal_5fd06f8dc7160.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386080/normal_5fda901184420.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454184/normal_60078c463a1a9.pdfIn PDF document text
    • https://cdn.sqhk.co/viwitukaz/jgRghid/template_icmp_ping_zabbix.pdfIn PDF document text
    • https://nomuxivobuga.weebly.com/uploads/1/3/4/4/134483798/sotebonumujaxane.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://bf6af823-cb0d-4ee8-9d5b-4f0b1de5ed24.filesusr.com/ugd/9eb187_4afe71c229f647f783fb97adad08aa71.pdf?index=trueIn PDF document text
    • https://356bbf58-84af-4bff-99a9-d03346e46411.filesusr.com/ugd/b5472a_be028abf14d94ba7997ce4b6a0652bdd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tawosutosuxi/ode_to_joy_sheet_music_clarinet.pdfIn PDF document text
    • https://s3.amazonaws.com/bojafazes/what_is_the_biblical_meaning_of_lucifer.pdfIn PDF document text
    • https://s3.amazonaws.com/wiremeresegikon/expanded_form_of_decimals_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/lekizopiloref/epson_printer_wf_2630_ink.pdfIn PDF document text
    • https://s3.amazonaws.com/gewuwasi/dirt_devil_power_max_pet_upright_vacuum_walmart.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_off0000ffd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD8 5668 bytes
SHA-256: 84943e20bf1332592045aa9b123dc09d7e59c33526c3720a62c9744365ecd279
font_01_sfnt_off00011321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11321 10556 bytes
SHA-256: abd74a18cad6b157e2dad89b56dc9c44228647a30fd2a44db84181126824a219

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