Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a971d79fb173215…

MALICIOUS

PDF

90.3 KB Created: 2021-05-03 16:09:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 166a4677a8647794470d14047aba305f SHA-1: d8a5aa2dc4823d38e94dde1dd25494b7dcb3b2e8 SHA-256: 0a971d79fb173215850bfbdae7c4b8f55e4d1aebaaf7efc59a4f99ff3de49023
244 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as a malicious redirector and a link farm, with numerous external links. One critical heuristic identified a link to known malicious redirector infrastructure. While no scripts were extracted, the structure and link farm nature strongly suggest a phishing or malicious redirection attempt, likely delivered as a spearphishing attachment.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=empire+mini+gs+for+sale+used In PDF document text
    • http://onenature.space/zumuvolaxozezapusakejhn58z.pdfIn PDF document text
    • http://solapp.xyz/41485696522fo4wm.pdfIn PDF document text
    • http://ig-objectionform.com/smoke_hollow_electric_smoker_manual6fouz.pdfIn PDF document text
    • http://fomijegi.mypressonline.com/what_is_body_armor_lyte.pdfIn PDF document text
    • http://hookup158.fun/dexovqdgsr.pdfIn PDF document text
    • http://nukels.xyz/162330193210mf8j.pdfIn PDF document text
    • http://sopisafexuj.sportsontheweb.net/anticoagulant_guidelines.pdfIn PDF document text
    • http://jukojadijomefar.medianewsonline.com/86380425878.pdfIn PDF document text
    • http://sozapemogoz.mygamesonline.org/wozig.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jawuwibunoropo.atwebpages.com/70725612184.pdfIn PDF document text
    • https://s3.amazonaws.com/jupudizadid/tavakorid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2871dedc-2962-40f1-aa5c-df9f8b158e67/sebexovuxamipi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e22e8ca5-da2c-4650-beed-9a1f5ceb8283/sabadakerajemejavido.pdfIn PDF document text
    • https://3edbbcf3-b5b1-446e-9630-835d38fa79e0.filesusr.com/ugd/6908d7_c0a6c0f035874940af024e5a48f95bee.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee635dff-7c77-430d-bcff-8f0059cb6669/fasatukufefisumawuperawek.pdfIn PDF document text
    • https://s3.amazonaws.com/zinudipir/taxabale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31a4f68f-7689-49b9-86d8-99e3c48c99ae/5790815054.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e466391-6d00-4502-9dab-cb9241202220/aprendizajes_clave_primaria_quinto_grado_2011.pdfIn PDF document text
    • https://s3.amazonaws.com/pogolo/crsu_ba_1st_sem_date_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06e4a675-e51d-4466-981f-3bb9b9d087cf/89071712617.pdfIn PDF document text
    • https://s3.amazonaws.com/lomogas/47300272871.pdfIn PDF document text
    • https://237a2310-9536-43ad-add1-fe73b840a51a.filesusr.com/ugd/8b319d_8ca257404d124a8e965a60bd8e33a062.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1110210f-8609-4373-abc4-fc81a9d4239c/lycoming_engine_overhaul_prices.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_off000124d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D8 5316 bytes
SHA-256: 89dc1698005a8deda0d5b5c8c08e4a491ad8aeee00827372641c9881b714f5c3
font_01_sfnt_off000136dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136DC 10776 bytes
SHA-256: f87027be41e7d6e641c5fdb381fda5adf4d2845b01b6e3e84b4ec357f12a62a1

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