Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cec5f0ce78d6116…

MALICIOUS

PDF

88.7 KB Created: 2021-02-14 02:19:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 8a2c24b19eebb0e9736751525695403d SHA-1: ad3188e8c33f9be00f7810be0715bdd1e3d520eb SHA-256: 5cec5f0ce78d6116d13c3d9ec11e2192165643818a49ce723522928d7b2e5999
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous embedded URLs, with at least one, 'https://jacksth.ru/123?utm_term=flying+ointment+witchery', identified as a potential lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's primary purpose is to host a large number of links, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are strongly indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/123?utm_term=flying+ointment+witchery PDF link annotation
    • http://trells.space/41694289092pvil4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457302/normal_5fe0d1a2b7177.pdfIn PDF document text
    • http://epaytds.xyz/ravished_by_the_triceratopssvzm2.pdfIn PDF document text
    • https://jifonoru.weebly.com/uploads/1/3/5/3/135316211/gisatitawun.pdfIn PDF document text
    • http://nizagose.66ghz.com/krishna_cartoon_images_hd.pdfIn PDF document text
    • https://votozugilom.weebly.com/uploads/1/3/1/0/131071295/7662049.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368772/normal_5fff5cd689563.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405638/normal_5fcb4178e4482.pdfIn PDF document text
    • https://lelopotive.weebly.com/uploads/1/3/0/7/130738546/667698.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408460/normal_5fd0af77ee437.pdfIn PDF document text
    • https://kunimagim.weebly.com/uploads/1/3/4/6/134608209/6462224.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://barajirotufaz.rf.gd/30425949979.pdfIn PDF document text
    • http://sunuwib.epizy.com/83990234822.pdfIn PDF document text
    • http://bavipilebevim.epizy.com/acrylic_mirror_sheet_singapore.pdfIn PDF document text
    • http://vukigopi.rf.gd/literature_trivia_quiz_questions_and_answers.pdfIn PDF document text
    • http://rigirulame.epizy.com/bipovutokifudodajubemuwed.pdfIn PDF document text
    • http://netupizorazez.rf.gd/17224599551.pdfIn PDF document text
    • http://mafujegimeti.rf.gd/nakudadil.pdfIn PDF document text
    • http://gizimup.epizy.com/95152734344.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_off00011d39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D39 4976 bytes
SHA-256: 69b180bb3b812ee404ee4d76eb3d9abfc084c0d59ef945b3851d66c080c7bf28
font_01_sfnt_off00012e1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E1F 12260 bytes
SHA-256: 591816cb83dc9760743f2686bcfccb64f1c6da19d36bad1ec8f1236980e223da

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