Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe30d50c4cdc5878…

MALICIOUS

PDF

87.5 KB Created: 2021-03-18 19:06:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 7f1e8e86da0779ef3164856f82142d8e SHA-1: 90352a0c5fa33aa0be0226f2b52965bd280fd221 SHA-256: fe30d50c4cdc587817a841d5a579ecc72330258293b51cc92c383350ee495fe6
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

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://lozipotod.ru/wix?keyword=zayre+department+store+bloomington+il PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4475380/normal_6017acd7dbc46.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466366/normal_604b2be01669b.pdfIn PDF document text
    • http://dujegud.getenjoyment.net/wonder_book_read.pdfIn PDF document text
    • http://wefilevazobakeb.mypressonline.com/13697530548.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487888/normal_603ba89cdd388.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413007/normal_5ff4bbc2994fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505699/normal_604dd751d23c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366015/normal_601dd1493e03a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376374/normal_6025046ae1314.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444356/normal_5ff08c67e55bf.pdfIn PDF document text
    • http://jokojujut.medianewsonline.com/explain_how_the_3_branches_of_government_work_together.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450154/normal_60248c016f14f.pdfIn PDF document text
    • http://rarubife.mygamesonline.org/how_to_use_fios_tv_voice_remote.pdfIn PDF document text
    • http://powajaxib.medianewsonline.com/shark_navigator_lift-away_deluxe_nv360_upright_vacuum_parts.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8964868a-aef6-4da0-9a9b-29de7c28e0c5.filesusr.com/ugd/b910ae_8246a212665547bfa3809c3b32bddb31.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/popilo/98811003400.pdfIn PDF document text
    • https://c6926203-1eb9-401e-9afa-11f61f201807.filesusr.com/ugd/685707_f9dfc780128a42cc8d38fc06907c2fce.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tozaduliwubega/23766333376.pdfIn PDF document text
    • https://ff9dba89-6132-4485-99c2-ace8a2453124.filesusr.com/ugd/c3f59f_c5129b079e0245e19c1e0d53ac11aff8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xeroguru/walmart_black_friday_nov_27_2020_ad.pdfIn PDF document text
    • http://zogoxuf.atwebpages.com/html_tags_and_uses.pdfIn PDF document text
    • https://s3.amazonaws.com/tamobalasu/human_geography_what_is_the_study_of_population.pdfIn PDF document text
    • http://rujidafedisezu.atwebpages.com/how_much_do_clinical_psychologists_with_a_doctorate_make.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_off00011536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11536 5480 bytes
SHA-256: 1104303a2ab2a9364f6557b157dfdc9f3de09307fa585c1677fb629dbe32d5d2
font_01_sfnt_off000127c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127C7 11460 bytes
SHA-256: 74cfcff072d83784297cb4325f35fc00e8ecc7cf323685c7f21572601e097c50