Malicious PDF — malware analysis report

Static analysis result for SHA-256 71e9100dbb4f5773…

MALICIOUS

PDF

91.0 KB Created: 2021-05-28 16:06:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: d0cd8dbd26f839cd9b5e962f2e7f38b6 SHA-1: 32e37305711377ba6879a73b06f73970ad72eae3 SHA-256: 71e9100dbb4f57733fb53a2cf7017ff0d57f12da7fba7786e9b112e2b779eb95
186 Risk Score

Malware Insights

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

This PDF document was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, appears to contain keywords related to gaming, likely as a lure to attract users to click on the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/strik?utm_term=ark+xbox+one+can%2527t+find+nitrado+server PDF link annotation
    • https://gomemaliji.weebly.com/uploads/1/3/4/0/134040406/2433235.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409409/normal_601813a64e653.pdfIn PDF document text
    • https://bofanowowedo.weebly.com/uploads/1/3/4/5/134506880/zabaxozapukoj_kejatixaxe_rures_rijujumidigagax.pdfIn PDF document text
    • https://rolemefusibo.weebly.com/uploads/1/3/0/8/130814279/68239a.pdfIn PDF document text
    • https://zisugopijelides.weebly.com/uploads/1/3/1/4/131438068/zuzogek.pdfIn PDF document text
    • https://xanilavobug.weebly.com/uploads/1/3/5/9/135959945/2461512.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450152/normal_5fd9b71a40ad4.pdfIn PDF document text
    • https://zafapuguma.weebly.com/uploads/1/3/2/7/132712217/b5a171c3.pdfIn PDF document text
    • https://pememeva.weebly.com/uploads/1/3/0/8/130874233/00ec26d07.pdfIn PDF document text
    • https://zuripiri.weebly.com/uploads/1/3/1/8/131856797/pudowa.pdfIn PDF document text
    • https://towetebofipu.weebly.com/uploads/1/3/1/4/131437669/kikoxosizisi-niwavonuzal-rireb-wibixujixiredid.pdfIn PDF document text
    • https://fikozipe.weebly.com/uploads/1/3/4/8/134887908/4a4f34c187.pdfIn PDF document text
    • https://lijafaxad.weebly.com/uploads/1/3/5/9/135989690/9948392.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4529977/normal_6031c0eb1036a.pdfIn PDF document text
    • https://rovunulaji.weebly.com/uploads/1/3/4/5/134529744/d9539b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425511/normal_602d43217c120.pdfIn PDF document text
    • https://tulixepatezapik.weebly.com/uploads/1/3/4/9/134902644/wibobutejuxixikir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474192/normal_60621f572d429.pdfIn PDF document text
    • https://kunobutos.weebly.com/uploads/1/3/4/2/134234797/sidel-lilenavebowir-latefitesalabe.pdfIn PDF document text
    • https://nenomoxemobare.weebly.com/uploads/1/3/6/0/136010140/kevoveribiro-tutipapudejuk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000117c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117C2 5124 bytes
SHA-256: ae23ca49f08fa54f93d8e5b421c06fc17baa3a93afa1684821aa48dc0ea50a0f
font_01_sfnt_off00012941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12941 11456 bytes
SHA-256: fdaec6ec4ee058be8096cb9d61a2e5f29092c49574ce8c224c1d6e7452d36eea
font_02_sfnt_off00015082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15082 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2