Malicious PDF — malware analysis report

Static analysis result for SHA-256 e59becd37a358b82…

MALICIOUS

PDF

78.9 KB Created: 2021-03-21 10:47:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: bef3fcdc6e5e54e94a68960c62bf3b49 SHA-1: 71ce7ac1cb87d390156a5bd0f94cace74583fe2a SHA-256: e59becd37a358b8293264513eba23e2f58b1d1c3389a8cc6e847f568c795d796
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs pointing to various PDF files hosted on disposable domains and free hosting services. The primary purpose appears to be SEO manipulation or directing users to potentially malicious content, as suggested by the PDF_SEO_LINK_FARM heuristic. No scripts were extracted, but the presence of multiple external links suggests an attempt to redirect users away from the current document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ponafet.ru/wix?keyword=layton+mystery+journey+apk+%25ED%2595%259C%25EA%25B8%2580 PDF link annotation
    • https://tevupuzenoxa.weebly.com/uploads/1/3/6/0/136009769/4528c0.pdfIn PDF document text
    • http://xoroketogejuxe.mywebcommunity.org/55406579828.pdfIn PDF document text
    • https://pexasuwen.weebly.com/uploads/1/3/4/5/134593650/lizarufemagakom.pdfIn PDF document text
    • http://wagekelazutus.22web.org/97279636835.pdfIn PDF document text
    • https://tobivuzulukimu.weebly.com/uploads/1/3/1/3/131384599/d44d7.pdfIn PDF document text
    • https://wufewevaso.weebly.com/uploads/1/3/1/4/131453291/pononezesol.pdfIn PDF document text
    • http://pumujavebedopa.iblogger.org/66140056018.pdfIn PDF document text
    • http://nidewopovuwubo.mypressonline.com/how_to_calculate_probability_distribution_for_a_discrete_random_variable.pdfIn PDF document text
    • https://dibalinelig.weebly.com/uploads/1/3/1/3/131380687/228174.pdfIn PDF document text
    • http://zizivumagove.iblogger.org/toto_sanitary_catalogue.pdfIn PDF document text
    • http://gojawufeki.getenjoyment.net/yamaha_portable_grand_dgx-505_user_manual.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://badememaveg.rf.gd/47111869725.pdfIn PDF document text
    • https://9170d309-caca-4186-8987-bf6b40ce219c.filesusr.com/ugd/baef12_7244e682cc924d4cad4a153333be9abf.pdf?index=trueIn PDF document text
    • https://6a1e2a5f-c456-4288-b9d5-5378f87870fb.filesusr.com/ugd/076fac_726cdb362a6541e392606d1353502c11.pdf?index=trueIn PDF document text
    • https://6f12065f-c45d-410c-b048-6ec23fb2b810.filesusr.com/ugd/02ccf7_595b7a8a139c454aad8016350404c460.pdf?index=trueIn PDF document text
    • https://6205d428-d5dc-494e-bbc3-e2236f9d811e.filesusr.com/ugd/6885a6_44be553338354ae2bfff9b30a1ef303c.pdf?index=trueIn PDF document text
    • http://padusij.onlinewebshop.net/fiwojejibunawexas.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE4 3164 bytes
SHA-256: 9cdf6c39b72a9254ccf6937222bade0a11c566f3fd32af596602f13769cf7eb3
font_01_sfnt_off0000f622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF622 5116 bytes
SHA-256: 13291a0352281679f8b262343f14a9a950afaf6ca20b6b0a1609324697c3d101
font_02_sfnt_off0001078b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078B 10872 bytes
SHA-256: 1a8187ae9fda7eb2df1bb5cb29fdea63e608e228cbe0c1f411dff900ddd1cebf

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