Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bdf61cbde865a88…

MALICIOUS

PDF

83.2 KB Created: 2021-04-09 04:36:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: f29d4d4edc59e54e4a3edf9e81d4d04a SHA-1: 5eefa91489baea9d547d9020d405bc9fa1346dcf SHA-256: 3bdf61cbde865a88166e7c2d13cd6704966662877ec5f2f0ffeb185b40de9707
126 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which point to disposable hosting services, indicating a link farm or SEO manipulation tactic. The primary external URI, 'https://zajinet.ru/strik?utm_term=what+is+the+proper+name+for+native+american', suggests a potential phishing or spam lure. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs strongly suggest malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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://zajinet.ru/strik?utm_term=what+is+the+proper+name+for+native+american PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4493579/normal_6062bd5051621.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446511/normal_605ba21fd4c1e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468828/normal_602227ea9023f.pdfIn PDF document text
    • https://pejeronasoko.weebly.com/uploads/1/3/2/6/132682646/wirupapesal.pdfIn PDF document text
    • https://xateboduf.weebly.com/uploads/1/3/1/4/131483383/bejevexodixe.pdfIn PDF document text
    • https://powelogub.weebly.com/uploads/1/3/1/8/131871449/tinosud.pdfIn PDF document text
    • http://kijekidajefi.getenjoyment.net/52226339230.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://61090d85-22e6-4724-b969-52a17785150c.filesusr.com/ugd/952c2e_b952ad65d9cf4bca8bf96dad7ce39d91.pdf?index=trueIn PDF document text
    • https://d90bda3b-35dd-409f-9d4b-b4a00d881a52.filesusr.com/ugd/b88e3d_47c36800f2c54c29952ee516bda8399c.pdf?index=trueIn PDF document text
    • https://673fcb93-492a-40d1-a7cc-77260b5c7816.filesusr.com/ugd/62d21a_7e513b61b7dc4d759f9ee8dd4a22801b.pdf?index=trueIn PDF document text
    • https://2061f665-9309-41a6-981d-137229ee7e60.filesusr.com/ugd/eb2fe6_31e7c9698a8246cabdfa25f0bc1b3a37.pdf?index=trueIn PDF document text
    • https://8c56b32b-3398-45d6-9c0b-b55146621f16.filesusr.com/ugd/6924eb_649faefb5e9a4c22b59bb6254ba3e9c2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2aa2eccb-fbc9-457d-9fea-ecf83b9023b2/52429475885.pdfIn PDF document text
    • https://e0271a52-a7af-48e9-8a99-924ce320ec62.filesusr.com/ugd/be5703_bfd893f54f2a47a2980ea8f03e95ab48.pdf?index=trueIn PDF document text
    • https://d920bd67-dfaf-4c99-85b0-fcb8118dfb91.filesusr.com/ugd/383849_ae9aa852419e4f7f8ec80b964773ccb3.pdf?index=trueIn PDF document text
    • http://polilofu.onlinewebshop.net/sony_hdr_as100v_battery.pdfIn PDF document text
    • https://313cea95-bd78-4864-9d9d-3b26c3bbe0bd.filesusr.com/ugd/2142af_685ade74d61f4629899f9d510691d8c3.pdf?index=trueIn PDF document text
    • http://sorisavitekinuj.onlinewebshop.net/space_maintainer_cekat_adalah.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/975542af-cb14-4884-bfec-f1544040fede/lunemijixejajubawuga.pdfIn PDF document text
    • http://vovojoj.atwebpages.com/easy_way_to_learn_guitar_chords.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_off000107f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F3 5296 bytes
SHA-256: cf5752f64edc43dfc9dde25970b97c5bf1eb92e1284a6728f394dc4594da7f39
font_01_sfnt_off000119e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E1 10984 bytes
SHA-256: 78d78045e61e1130897d15c650fb44391c271afb813b513230dd25386952a640