Malicious PDF — malware analysis report

Static analysis result for SHA-256 17b24b445bd0ecb0…

MALICIOUS

PDF

120.0 KB Created: 2021-03-29 15:51:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 4356cc3d968cbfba3328ac97c588dc7c SHA-1: 0e6499b40bcb10625b94bf1172be9901b9697497 SHA-256: 17b24b445bd0ecb0c4f5e687abe91296046bee132e2316ca6ae9f5816b942537
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 or link farms, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing lure designed to trick users into visiting potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://seumenha.ru/award?keyword=cg+police+def+question+paper+2020+pdf PDF link annotation
    • https://cdn.sqhk.co/wipabamof/AiiAilA/flying_monkeys_key_west_fl_33040.pdfIn PDF document text
    • http://tryraisins.pro/fonatuximabenolou32xt.pdfIn PDF document text
    • http://hargotel.xyz/fupufutunujavohah7.pdfIn PDF document text
    • https://cdn.sqhk.co/kusewupudin/5gh7ehg/34677175971.pdfIn PDF document text
    • https://cdn.sqhk.co/jojojidatun/xjage5j/26837241422.pdfIn PDF document text
    • http://meetchambre.xyz/what_size_file_for_455_rancherbrep1.pdfIn PDF document text
    • http://carbackseat.site/72939554268zehhi.pdfIn PDF document text
    • https://cdn.sqhk.co/wipedekis/Z9ggthd/dune_2020_cast_list.pdfIn PDF document text
    • https://cdn.sqhk.co/worenora/jic2Thi/39482326197.pdfIn PDF document text
    • https://cdn.sqhk.co/serodozire/DgUgeji/21113615170.pdfIn PDF document text
    • https://cdn.sqhk.co/joxopejufito/jago5H6/27713212730.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7737876a-f762-42ef-af6f-18b78abacabf.filesusr.com/ugd/9066bd_62290a9cdbb047829082120b1bca0861.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gimufesajo/annihilation_of_caste_malayalam.pdfIn PDF document text
    • https://781b76d0-895c-4d4e-90f3-491762fad171.filesusr.com/ugd/894952_5a9cf3984aed435fbcece162dd74954b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/votawawo/principles_of_accounting_notes.pdfIn PDF document text
    • https://s3.amazonaws.com/jijumupade/fishing_report_nj_sandy_hook.pdfIn PDF document text
    • https://s3.amazonaws.com/bubeto/bjt_3904_datasheet.pdfIn PDF document text
    • https://17673d3b-e5d0-4e0e-8211-f079fadf35f5.filesusr.com/ugd/13ae68_7401d807e1104a2a9daca1ffcb3fb842.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lolaritemukole/95045459182.pdfIn PDF document text
    • https://s3.amazonaws.com/bifadiwuwileji/36979215234.pdfIn PDF document text
    • https://3e1ae61b-6b68-46dc-8a90-d1c7a5b9f91c.filesusr.com/ugd/b8bbd7_7f8e21ac28aa453d8738c26f5e72b94d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/divelatoxa/baidu_pc_faster_terbaru_full_version.pdfIn PDF document text
    • https://s3.amazonaws.com/dedinavesute/78601034232.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off000195c2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x195C2 20532 bytes
SHA-256: f3c7e394bb226569ae19f057450c260bf3229cd790556436a3870a73659a8895
font_00_sfnt_off000150a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150A2 5628 bytes
SHA-256: 6f5e3817723ba66f269594ed0500e09b6e1e8fb01e6f01be1a2cf40e1281ffb0
font_01_sfnt_off000163d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163D1 3720 bytes
SHA-256: d0c9e33916e9e64e42e31bcf0d345f6c2fcd41735b1a34df0119bd0eb1094281
font_02_sfnt_off00016f35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F35 11272 bytes
SHA-256: 520e070399b00dab3145fe3168e0c7edd4338cb8d083d22c47b2f4aeec98028d

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