Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b0566b441920dab…

MALICIOUS

PDF

84.7 KB Created: 2021-03-16 05:47:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 80334ac9da4ebb1c6bae600656a7805a SHA-1: 1d9b6b4858229ce632a7c375eeff3250f0fd0d15 SHA-256: 7b0566b441920dab87956bd7c1f673f390f37dbbb55522146dec9e11e6933c90
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external URLs, many hosted on disposable domains, suggesting an attempt to manipulate search engine results or direct users to malicious sites. While no scripts were explicitly extracted, the PDF structure and the presence of many external links are indicative of a phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://nipisod.ru/123?utm_term=dushyant+chautala+song PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4402933/normal_604655b041a0f.pdfIn PDF document text
    • https://cdn.sqhk.co/vopofuxo/ia0jenU/download_unmatched_air_traffic_control_mod_apk_data.pdfIn PDF document text
    • https://cdn.sqhk.co/mujawiru/gh70Ph2/world_cup_2022_qatar_schedule.pdfIn PDF document text
    • https://cdn.sqhk.co/jopubelo/ghcgcBI/sumi_sumi_matching_puzzle_mod_apk.pdfIn PDF document text
    • http://silewugebed.scienceontheweb.net/listino_prezzi_alfa_romeo_stelvio.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392864/normal_603823cbea550.pdfIn PDF document text
    • http://bagesopabiwub.scienceontheweb.net/plan_y_programa_2011_sexto_grado_primaria.pdfIn PDF document text
    • https://cdn.sqhk.co/roxirali/4P2jfFD/vuxufojudizeru.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501057/normal_600da3b69483d.pdfIn PDF document text
    • https://cdn.sqhk.co/xevezele/ijdjjhh/mexoj.pdfIn PDF document text
    • https://tiforunu.weebly.com/uploads/1/3/1/4/131437018/6245801.pdfIn PDF document text
    • https://tesebajaja.weebly.com/uploads/1/3/4/4/134402558/zipesikewimo.pdfIn PDF document text
    • https://pedasivu.weebly.com/uploads/1/3/5/3/135387907/6c8b5526.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455639/normal_60267f7c98333.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://s3.amazonaws.com/xamibebulosaxug/70801053384.pdfIn PDF document text
    • https://s3.amazonaws.com/jawusawar/xuxanex.pdfIn PDF document text
    • https://fa202315-5cd5-4006-9a99-7c5d4406650e.filesusr.com/ugd/61804c_cd960fe5519b48448715714466429b6d.pdf?index=trueIn PDF document text
    • https://18b62485-dce0-4e35-9712-b1d1f13fcb23.filesusr.com/ugd/296484_4d7f8034bd32455baa90223ae5714204.pdf?index=trueIn PDF document text
    • https://5053e88e-9e18-4719-890c-32a1cca0295d.filesusr.com/ugd/411503_ca0dc67ca70d4cc68b61cbaeb406e093.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/senodiw/indefinite_pronouns_worksheet_for_grade_2.pdfIn PDF document text
    • http://vujuvisesakok.myartsonline.com/71704484105.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e88a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE88A 5064 bytes
SHA-256: 01eff47d38dd457ccbdc77508f7e84ae04111bd2f0fbe5a9e17438c54585cc01
font_01_sfnt_off0000f9d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D5 10860 bytes
SHA-256: 679e970fa55721ce6b94dffeedd48df16c66adcc6d694e1a6761107ae2e22110
font_02_sfnt_off00011f20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F20 16036 bytes
SHA-256: 52db30b66cfb76898988bc7c6ed152514c301740808ab95bec9c68e49df23550
font_03_sfnt_off000133c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133C4 4488 bytes
SHA-256: e10ed2222216d0807f7f021adc349d34be2d6941f6ac1a45d24f54294ee164f6

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