Malicious PDF — malware analysis report

Static analysis result for SHA-256 87f4d907d051d3ac…

MALICIOUS

PDF

76.9 KB Created: 2021-03-10 04:43:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 867e373da2e3e0395601da5c2d2540f8 SHA-1: e49f95cfff7d33cd61ae602089a7017542889e71 SHA-256: 87f4d907d051d3acc97a8c56278308517174427b7b228bfd07f2419865b51051
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The document body is heavily obfuscated, but the presence of external URIs and the PDF_SEO_LINK_FARM heuristic strongly suggest the intent is to redirect users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/strik?utm_term=can+you+download+gimp+on+mac PDF link annotation
    • http://xejevojesinil.22web.org/wavelet_transform_matlab_github.pdfIn PDF document text
    • https://nozinogut.weebly.com/uploads/1/3/1/1/131164424/zemarerakupuzem.pdfIn PDF document text
    • https://nenuwuxajifop.weebly.com/uploads/1/3/4/6/134665141/zurekuxubexog-popupe-fexozukoxavan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475741/normal_60410e3f0af89.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465703/normal_601254fe4b777.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467300/normal_5ff7d657bc914.pdfIn PDF document text
    • https://tapuwapefozex.weebly.com/uploads/1/3/4/3/134350869/554f8ce13ffd1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426080/normal_5ff1224199795.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448113/normal_601b0ff6e4b20.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c8a164a7-2549-4056-b209-d27d417f800b.filesusr.com/ugd/136d3d_ce14668d1969427b8083794f0cb8e55b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b68c6a4-d7e5-4a6c-91f6-5de8401929ef/the_logical_song_supertramp_meaning.pdfIn PDF document text
    • http://jakukimokop.rf.gd/primeros_auxilios_ingles_traduccion.pdfIn PDF document text
    • http://bonezulaw.rf.gd/bayer_aspirin_safety_data_sheet.pdfIn PDF document text
    • https://709e7e89-b264-4d73-b757-064736ed86f1.filesusr.com/ugd/f523c3_f9e057c14e6649b49f8189099383387c.pdf?index=trueIn PDF document text
    • http://rumapipenuwiwo.rf.gd/latest_android_smartphones_under_20000.pdfIn PDF document text
    • https://f7cac2f2-528f-490f-9bef-cb2448a877de.filesusr.com/ugd/529ba0_00d9c98d9b854207a424ecd17b28bf03.pdf?index=trueIn PDF document text
    • http://vipowiso.epizy.com/ipcc_2006_guidelines_emission_factors.pdfIn PDF document text
    • http://rebokomixuxoj.epizy.com/what_does_the_ages_mean_in_the_bible.pdfIn PDF document text
    • https://899154e9-876a-4ab4-94d5-c8ef2aed10f2.filesusr.com/ugd/dcf9ad_3230c7ab2d17415fbb4b4d3ba8d16e90.pdf?index=trueIn PDF document text
    • http://tijopuzotozume.rf.gd/sufefe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00295dd4-93df-4206-b81e-0e9948a2cbf1/what_is_principal_stress.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_off0000efe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE6 5220 bytes
SHA-256: e9283ee4e85bc69041a83371cc9e15b103785fe63cb81746c12f9514bd0ab906
font_01_sfnt_off000101b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B8 10820 bytes
SHA-256: 44e1adbd84b7d460e08d3d812c712af3b7085713071972a64c9a3ec260a04de5