Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc30ddf5ee1b0c8f…

MALICIOUS

PDF

89.4 KB Created: 2021-03-15 23:43:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: f45b13d7ad3b8a2144bc016f14acd1c2 SHA-1: abb4f5f149ad165b86d9435463399926ad9fbf2a SHA-256: cc30ddf5ee1b0c8f52eb680717a9e99b36974a027fd42c2d52f42fb11e7b814a
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on disposable domains, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs likely serve as lures to download further malicious content or redirect to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • 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/strik?utm_term=ernest+hemingway+books+in+chronological+order PDF link annotation
    • https://jefanumu.weebly.com/uploads/1/3/4/8/134889008/1d9577760a.pdfIn PDF document text
    • http://rokexulom.22web.org/luneka.pdfIn PDF document text
    • http://kernig.store/arnold-_chiari_1_malformation6jr8z.pdfIn PDF document text
    • https://wuwilosuz.weebly.com/uploads/1/3/4/3/134394730/1b65a9d.pdfIn PDF document text
    • http://zzzmmmmejjj.space/persepolis_rising_book_reviewxeb9n.pdfIn PDF document text
    • https://vazanopika.weebly.com/uploads/1/3/4/8/134896022/vefefunejo.pdfIn PDF document text
    • http://bukufekuda.22web.org/how_does_full_house_work_in_poker.pdfIn PDF document text
    • https://vedokaxo.weebly.com/uploads/1/3/4/5/134529556/nifapewasose-sarawegurodoko.pdfIn PDF document text
    • https://digojumowixev.weebly.com/uploads/1/3/5/9/135989627/kujuduzifu-rebukitomozag-dewifemor-zefow.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xepalufozakot.epizy.com/platform_wedge_high_heels_shoes.pdfIn PDF document text
    • https://ad9e3d1f-bb22-46ca-892e-b6aa3325a756.filesusr.com/ugd/837d34_4d674756cedf475e9ec3e5a526bb90c7.pdf?index=trueIn PDF document text
    • https://22fea36a-5e19-4af1-b4aa-fe6e1efe0ee9.filesusr.com/ugd/b5a188_3a55254e2bbc4961939439d091b78087.pdf?index=trueIn PDF document text
    • https://b19b3b79-9ae2-4e99-9b16-ef32671d60f4.filesusr.com/ugd/0bc867_e4ea2bde9d58499cb9c21711fa542f84.pdf?index=trueIn PDF document text
    • https://5ce19dfa-329f-495d-88d1-e1e7834d9072.filesusr.com/ugd/d902bb_e944e044aeac4a31918fba7954d5f5c0.pdf?index=trueIn PDF document text
    • https://ec679cc6-872a-45a8-b2fd-b1bc8f6ddb77.filesusr.com/ugd/d1d005_935912e880664a66bd116e41890ad655.pdf?index=trueIn PDF document text
    • https://4dcfe184-cd6c-48f8-9f23-5461c743a1d4.filesusr.com/ugd/cc8533_e97695a6b8fe47b9a4dee4b023377f0a.pdf?index=trueIn PDF document text
    • https://ca6b24e6-01cd-4368-a310-1df05077a315.filesusr.com/ugd/11b39a_98162349dd994a11a0d43e8e934aa8a8.pdf?index=trueIn PDF document text
    • https://ad9e3d1f-bb22-46ca-892e-b6aa3325a756.filesusr.com/ugd/837d34_5f2df0d7c8fa409ca88801434f6e3f70.pdf?index=trueIn PDF document text
    • https://1580f21e-fc75-4350-9669-3be8b7525729.filesusr.com/ugd/eff6cf_bab40b5172a94fa2857302985abd6b78.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3B 5708 bytes
SHA-256: 31c5e62770f009fad651d680651e3c4837df8ab7b6f5ecee83c6a42e85b2af67
font_01_sfnt_off00011090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11090 1956 bytes
SHA-256: 1a02017d8f9dfccebdf658a6e57aaf3f1db45e167806d7a7e54ac7b5b333925c
font_02_sfnt_off000119b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B3 11352 bytes
SHA-256: 293b2569c2f2602e029d80d315f719420674c00215af113ba4ec6079c6ce6489
font_03_sfnt_off00014033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14033 16312 bytes
SHA-256: bf8f9ece8d9d74ce2d7a98a07ee1bb8f4056faf702b3b1702118181e85f1b939

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