Malicious PDF — malware analysis report

Static analysis result for SHA-256 617aeb51f13817f0…

MALICIOUS

PDF

77.6 KB Created: 2021-03-24 15:36:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0bdd320b543980700e74b6c1fc88793e SHA-1: aed5831f13f97f53baae8fa419ba64da66f2eeee SHA-256: 617aeb51f13817f0d6446ac892439b4dfa6cf0c14b827811bc6fefe4aef004e2
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a potential link farm. One prominent URL, 'https://botokaw.ru/123?utm_term=dna+structure+coloring+worksheet+answer+key', is presented in the document body, suggesting a lure to external content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malicious content via the link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://botokaw.ru/123?utm_term=dna+structure+coloring+worksheet+answer+key
    • https://cdn-cms.f-static.net/uploads/4366630/normal_5fd8c9c360c80.pdf
    • https://cdn-cms.f-static.net/uploads/4420764/normal_600d61be69391.pdf
    • https://cdn-cms.f-static.net/uploads/4368747/normal_604d64b5c9c91.pdf
    • https://static.s123-cdn-static.com/uploads/4366000/normal_5ffb5d3ec336f.pdf
    • https://cdn.sqhk.co/togareguko/fheihGK/3147312453.pdf
    • http://serikanipesemo.iblogger.org/bodaluronikuvodopuj.pdf
    • https://static.s123-cdn-static.com/uploads/4489724/normal_60021dd0772bf.pdf
    • https://static.s123-cdn-static.com/uploads/4470681/normal_5ffeb02488f75.pdf
    • https://cdn-cms.f-static.net/uploads/4486192/normal_605259bb46113.pdf
    • https://static.s123-cdn-static.com/uploads/4497359/normal_5fe0c9dd17961.pdf
    • http://wigogaduxatinuv.iblogger.org/67560929610.pdf
    • https://cdn.sqhk.co/libavesonon/RN9HgcN/23074490172.pdf
    • https://cdn-cms.f-static.net/uploads/4483083/normal_602df19ea19c3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gixirojozogufux/zoluki.pdf
    • https://s3.amazonaws.com/vapite/aditya_hridaya_stotra_song.pdf
    • https://76ed6b59-b034-43ac-b949-e1c08f76e3cb.filesusr.com/ugd/ee6100_40a516118c7046399b3c9bebc366836e.pdf?index=true
    • https://61069a5e-3c5f-4884-a3c7-8c7552058b74.filesusr.com/ugd/0789d5_679349c4544d4f9693c53e9241bd5f79.pdf?index=true
    • https://s3.amazonaws.com/tawovojo/sikerebelijusado.pdf
    • https://fe2b84af-b373-48e0-a714-f820169e3fe9.filesusr.com/ugd/ed1d2e_43a83eded8c7474ea2331cbe859c9dec.pdf?index=true
    • http://mudepenota.epizy.com/dovebopixajatunam.pdf
    • https://d429d46a-6203-486b-8c9d-ede5597e1383.filesusr.com/ugd/419b00_9050008e0f3546da8e3d470243a3f234.pdf?index=true
    • https://s3.amazonaws.com/jemisajoda/echo_power_blower_pb-250ln_parts.pdf
    • https://s3.amazonaws.com/dudurat/vasantham_channel_guide.pdf
    • http://satovixu.rf.gd/buvumisemi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0c0.bin
48da7b6f41829b834414a7a7bc491de3bdde21bdad93e2c1517a7997ce5814cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C0 5320 bytes
font_01_sfnt_off000102f1.bin
7d10acee1250004a90eaf12716ff0724b5da8f5a405b6e860a931a24e3aab3d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102F1 10692 bytes

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