Malicious PDF — malware analysis report

Static analysis result for SHA-256 993dbe4f2ee148b3…

MALICIOUS

PDF

77.9 KB Created: 2021-05-05 02:28:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 9c5354fd96da415809d5585f0ffe0214 SHA-1: 593f979e1ce6ea3a1a08d551f34ec215d2592555 SHA-256: 993dbe4f2ee148b323186eba2fb320cff8a1a1ff3d83252b655a7f67e82df3f9
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://gimoguvi.ru/strik?utm_term=mesa%252Fboogie+triple+rectifier+150-watt+tube+head PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4458150/normal_5fdf392aa8d6a.pdfIn PDF document text
    • http://mekozeka.66ghz.com/66298641859.pdfIn PDF document text
    • http://besefobusim.mypressonline.com/mental_health_first_aid_australia.pdfIn PDF document text
    • http://jofifuneku.medianewsonline.com/how_to_repair_pressure_washer_hose_hole.pdfIn PDF document text
    • http://refazali.mygamesonline.org/dabozotuxulakifenop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445735/normal_60430e656e04b.pdfIn PDF document text
    • http://wizoditororoxo.iblogger.org/iso_14001_afnor.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407818/normal_5fcd15e75a5a5.pdfIn PDF document text
    • http://murimubijejaba.mygamesonline.org/augusto_cury_ansiedade_1_download.pdfIn PDF document text
    • http://mimivamefigupe.sportsontheweb.net/common_medication_prefixes_and_suffixes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402960/normal_603a9b9180dd7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vopapokolozanum.rf.gd/gujorigixisava.pdfIn PDF document text
    • http://jigiwema.epizy.com/carboxylic_acids_list.pdfIn PDF document text
    • http://xoroniwogogo.rf.gd/28165839344.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e073e460-56a7-41d6-9d92-3a6f32cd3dba/vapuluref.pdfIn PDF document text
    • http://jivuruponozo.epizy.com/bmw_x5_m_performance_2016.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66f880ee-8848-48c0-8f57-d5c553f728cc/clases_de_ingles_gratis_para_adultos_en_houston_tx.pdfIn PDF document text
    • http://gamukudolaxe.epizy.com/12372833980.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e66eef77-9adf-43cd-b7ae-a9537453aba3/how_do_i_find_my_routing_number_53_bank.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_off0000ed58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED58 6040 bytes
SHA-256: 30fd36c8c72b49ecd4971666cadee729c03f6c785fade3ed3a46f2a0692fe0ee
font_01_sfnt_off00010218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10218 11280 bytes
SHA-256: 1ffe35aac9cec3346835fa9e8350043c4d7b372b85fa5ce7af81ded423d13193

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