Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8fe1d38f9bad3d1…

MALICIOUS

PDF

145.0 KB Created: 2021-04-23 03:41:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 9c179456096682a61df31dbb9ec8c6ba SHA-1: 76478cf3e59dffd21a22ed2975e02e623090d78c SHA-256: f8fe1d38f9bad3d143f41858ec8c3c66cd8e43bf70834089a948dd739274a6b3
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The document body, though heavily obfuscated, appears to be a lure related to search queries.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://vilenefex.ru/strik?utm_term=what+is+a+biological+rhythm+psychology PDF link annotation
    • http://vovality.club/necchi_sewing_machine_repairs__servicevrnji.pdfIn PDF document text
    • https://pixasarajesuwov.weebly.com/uploads/1/3/4/6/134688766/wetedevazakem-gimurotume-viwepuzaxiwapu-tedopej.pdfIn PDF document text
    • https://zedimubaxujejit.weebly.com/uploads/1/3/4/7/134715534/6374913.pdfIn PDF document text
    • http://ogranicbio.fun/how_do_i_check_my_icloud_storage_on_my_ipadj6jft.pdfIn PDF document text
    • https://guxiwuwo.weebly.com/uploads/1/3/1/0/131070036/petiwijow.pdfIn PDF document text
    • https://sobasoje.weebly.com/uploads/1/3/2/6/132695832/3040304.pdfIn PDF document text
    • http://uplrezina.site/what_is_the_best_karcher_jet_washr5kr8.pdfIn PDF document text
    • http://gachihyper.xyz/kugujomubedurejuliziwrc9a.pdfIn PDF document text
    • http://maturibcgj.space/42423895403nkxy7.pdfIn PDF document text
    • https://sinipipa.weebly.com/uploads/1/3/0/8/130874509/leworusidifubeve.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed338f79-21c9-4d79-8af9-ca26c009582b/how_many_calories_in_a_medium_wendys_large_chili.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15044145-9047-4c2d-96e2-763b8bd8f7a4/95133926757.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be1eb1f6-8bc8-4b8f-98c6-2fd1abc3cb4b/lugijezonupipa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc4a9285-887f-49dd-864b-cd7ab814a98a/vujixadupamubimuluteb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd8aa9c6-3a7c-4490-8b75-aed9b71f4b34/71174634412.pdfIn PDF document text
    • http://vosoziwidusetur.rf.gd/how_to_do_a_family_time_capsule.pdfIn PDF document text
    • http://zikenonuto.epizy.com/assessable_spouse_election_form_where_to_send.pdfIn PDF document text
    • http://guwivuvasexi.epizy.com/goguziwikidivinibo.pdfIn PDF document text
    • http://ponowepu.rf.gd/69953584855.pdfIn PDF document text
    • http://vafalugetuxibo.epizy.com/inventions_and_discoveries_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a89581f-e6d9-4b89-b285-ff60eab21c87/36531585010.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001e3cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E3CD 5600 bytes
SHA-256: b93f2aab94ce02d21b376d7c66bf1a368d9a3182d57bd108993dfd96941d3961
font_01_sfnt_off0001f6c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F6C3 13224 bytes
SHA-256: 49a46a55b22f73017b16898607ad9d4416061bc3b638306b05ab0c0e23e8c274
font_02_sfnt_off00022194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22194 16084 bytes
SHA-256: ff88491e9b53368aa3a30e8dd34a5b3a2a650623abbadb69eae8d512e7150c33