Malicious PDF — malware analysis report

Static analysis result for SHA-256 81500fb96cdc66de…

MALICIOUS

PDF

77.5 KB Created: 2021-02-25 10:43:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 664b3f69de88f417792805b25ed36f67 SHA-1: 49dc169444c41ef48c502222ffa8031d3b8f4153 SHA-256: 81500fb96cdc66de012de6a58e1ac37758fa9dc0b07db5450c2639a72013278d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with one prominent URL pointing to 'jottigo.ru' and containing a search term related to printer toner. This suggests a phishing or malware distribution attempt, likely using a lure related to printer supplies. The ML classifier and ClamAV detection strongly indicate malicious intent. No scripts were extracted, but the PDF structure itself is designed to host and present these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://jottigo.ru/strik?utm_term=hp+laserjet+m1212nf+mfp+toner+model PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4482849/normal_5ffdd7ab5dbd3.pdfIn PDF document text
    • http://montana-media.com/the_chemistry_of_complex_ions_lab_answerss5104.pdfIn PDF document text
    • http://heleogose.online/48433416391vs5cr.pdfIn PDF document text
    • https://bibasalerudo.weebly.com/uploads/1/3/1/8/131857029/tekumarozewuta-muteliworitojoj.pdfIn PDF document text
    • https://rarejiwu.weebly.com/uploads/1/3/1/6/131606055/dalokoz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383791/normal_601dbb06265b4.pdfIn PDF document text
    • https://cdn.sqhk.co/kososojog/heie70J/airplane_movie_quotes_jive.pdfIn PDF document text
    • http://lumobumekola.getenjoyment.net/schlage_keyless_door_lock_change_battery.pdfIn PDF document text
    • https://komuwewolidixat.weebly.com/uploads/1/3/4/8/134871085/zufaxiwudu.pdfIn PDF document text
    • https://vigekajabaka.weebly.com/uploads/1/3/4/7/134708837/092b562bef5101.pdfIn PDF document text
    • https://cdn.sqhk.co/toxotunem/aYJX2ja/6013414239.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473384/normal_5fc84b7ab99ef.pdfIn PDF document text
    • https://poxosopetijonaj.weebly.com/uploads/1/3/1/4/131453527/mabugixefe.pdfIn PDF document text
    • http://sujegudapapew.iblogger.org/kapivipopusufigadifa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365642/normal_5fcf4abab3199.pdfIn PDF document text
    • https://cdn.sqhk.co/bikegola/O3vggji/ginawuva.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kedisijusa.onlinewebshop.net/ladalotopegusafese.pdfIn PDF document text
    • http://nupepepasis.rf.gd/which_business_is_most_profitable.pdfIn PDF document text
    • http://bezegorev.epizy.com/free_ppt_on_autoclaved_aerated_concrete.pdfIn PDF document text
    • http://gekasudevij.epizy.com/chainsaw_sharpening_file_guide_stihl.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f10b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10B 5408 bytes
SHA-256: 5d15273fdf2c9067266bffab80d191b25b8f9fa8eb295cd450df84d82cd4c33e
font_01_sfnt_off00010363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10363 11016 bytes
SHA-256: 80e8a637b4204e8370e69a369679ac03849b18bc86b98a4e6c9335595580b28b

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