Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1fec363acd00c32…

MALICIOUS

PDF

81.2 KB Created: 2021-03-11 10:06:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 7b715a7c01d6d2bdb6052af993691922 SHA-1: 1899b324164a6028a6addcaa41b73b23e041767a SHA-256: e1fec363acd00c327a3e5022b371b69c71d9ccd29e7676e932cf2edf92ac41eb
186 Risk Score

Malware Insights

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

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 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://fokemale.ru/strik?utm_term=how+can+students+improve+time+management+skills PDF link annotation
    • https://vixadabunukup.weebly.com/uploads/1/3/4/9/134902839/462ba8d513cba72.pdfIn PDF document text
    • https://tobivuzulukimu.weebly.com/uploads/1/3/1/3/131384599/lozuxomukolu.pdfIn PDF document text
    • https://tabogivazosepa.weebly.com/uploads/1/3/1/8/131871767/26c742.pdfIn PDF document text
    • https://fojomifurinu.weebly.com/uploads/1/3/1/3/131378835/zilipolafega.pdfIn PDF document text
    • https://xiwajuropoji.weebly.com/uploads/1/3/4/3/134371127/9090796.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370762/normal_603ac0fe51a0a.pdfIn PDF document text
    • https://vujezogovi.weebly.com/uploads/1/3/5/3/135348950/nekosodoz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466398/normal_60228993784af.pdfIn PDF document text
    • http://wijofotezopadik.medianewsonline.com/bls_algorithm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380691/normal_60463478ada75.pdfIn PDF document text
    • http://kitafoged.medianewsonline.com/how_to_reset_beats_powerbeats_3.pdfIn PDF document text
    • https://vabomunebalobi.weebly.com/uploads/1/3/1/8/131856010/8844034.pdfIn PDF document text
    • https://sisuwajad.weebly.com/uploads/1/3/0/8/130874073/mamulisukexibures.pdfIn PDF document text
    • https://litunuvojiv.weebly.com/uploads/1/3/0/9/130969221/1761447.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/647bca99-8632-49dc-a290-568c6bcafe4c/lusanavofog.pdfIn PDF document text
    • http://kafotafuvodalix.onlinewebshop.net/is_flavoured_soy_milk_good_for_your_skin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7c86d1e-953e-499c-b524-8d13cf176e41/what_happened_to_senator_sam_foley_in_washington_who_will_appoint_the_new_senator.pdfIn PDF document text
    • http://sutebavo.rf.gd/10130087857.pdfIn PDF document text
    • http://dararexirebugus.epizy.com/bluedio_hurricane_manual.pdfIn PDF document text
    • http://tewidunutazi.rf.gd/ajith_songs_kuttyweb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b78929a7-a80d-4748-bd96-66276592a546/warehouse_safety_meeting_topics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aca1c11f-23c4-4477-9788-8d67d31ba4e5/mivomire.pdfIn PDF document text
    • http://lukugebov.rf.gd/barbell_and_dumbbell_workout_routine.pdfIn PDF document text
    • http://sulijugofogim.onlinewebshop.net/mabupefir.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_off0001008d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1008D 5572 bytes
SHA-256: 74003500e46d30b714aa5cbaac08c31401fa901ffee6f18e766de0e4326f340e
font_01_sfnt_off00011383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11383 10420 bytes
SHA-256: a10d2ae114eadb8dadae434c895b4a63d499065389764674870a3c0ade6367c1