Malicious PDF — malware analysis report

Static analysis result for SHA-256 880b51c1c257a18e…

MALICIOUS

PDF

72.9 KB Created: 2021-05-27 15:08:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 2da83b313aeae57efc26665631d46a84 SHA-1: 75db4aef609726418230b7093d43f8e9b1875684 SHA-256: 880b51c1c257a18ed080615546053f1cbcafa4302be76ece4939c60f5ad4b617
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains and Weebly-hosted PDFs, indicating a link farm or SEO manipulation tactic. ClamAV detected this as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of embedded URLs and the structure suggest an attempt to redirect users to potentially malicious content or phishing 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://baarspo.ru/strik?utm_term=rachel+mae+buffett+sentence PDF link annotation
    • https://wegetifadozapuf.weebly.com/uploads/1/3/1/6/131637062/ed58fd189.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414849/normal_5fe1890bceff2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368978/normal_5fd9b5ae9eb91.pdfIn PDF document text
    • https://bategasef.weebly.com/uploads/1/3/2/7/132712490/bivokako.pdfIn PDF document text
    • https://fokifukamanur.weebly.com/uploads/1/3/0/8/130874497/dukajapowib.pdfIn PDF document text
    • https://repiwolaz.weebly.com/uploads/1/3/1/3/131381539/5557722bff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458389/normal_60240102d3c89.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393356/normal_5ff477d795099.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449984/normal_605057063bdb5.pdfIn PDF document text
    • https://matubupediguja.weebly.com/uploads/1/3/4/1/134131452/d43540b53.pdfIn PDF document text
    • https://suvamowifav.weebly.com/uploads/1/3/4/3/134351486/6412822.pdfIn PDF document text
    • https://nulosumewure.weebly.com/uploads/1/3/4/6/134645663/pekifak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420902/normal_6045ee828ddee.pdfIn PDF document text
    • https://sixupotivene.weebly.com/uploads/1/3/4/3/134305687/filawo_tapisene_wokujuxakureje_xexik.pdfIn PDF document text
    • https://libakitaxejadeg.weebly.com/uploads/1/3/4/0/134096258/bonurikado.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446382/normal_60062f42789da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371495/normal_605b5ed4890f7.pdfIn PDF document text
    • https://lorufolirosob.weebly.com/uploads/1/3/4/5/134584190/fagosinawizozawenis.pdfIn PDF document text
    • https://wuwawibef.weebly.com/uploads/1/3/4/6/134608234/6a67d718.pdfIn PDF document text
    • https://bivamotitujodo.weebly.com/uploads/1/3/4/7/134712473/4357595.pdfIn PDF document text
    • https://posapana.weebly.com/uploads/1/3/1/4/131454172/kebotudupa_lubojife_xupadinu.pdfIn PDF document text
    • https://sadaxolofomet.weebly.com/uploads/1/3/1/4/131453623/2e39399.pdfIn PDF document text
    • https://bawekiseboluxis.weebly.com/uploads/1/3/5/3/135327810/pilanewedugisiro.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000df77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF77 5172 bytes
SHA-256: ba7984527a67b679e12312254c1d9cbba559026a02d74fe57a0d57afc518c66e
font_01_sfnt_off0000f0f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F3 11000 bytes
SHA-256: efeab4b547212182b919594d1f3ad37080a7f00dec70c669cc99c92090ed05a2