Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3057eca559c7c4d…

MALICIOUS

PDF

78.4 KB Created: 2021-02-14 10:59:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 439676c46be7f2ae8075bf7c4f5ed120 SHA-1: 26a574dc84daa664e2b80df22bdd5fff21d2c97e SHA-256: c3057eca559c7c4d1712d33f48095e12e51190ce7faca45a6b19d019ab299331
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with one prominent URL pointing to 'jottigo.ru'. This suggests a phishing or SEO manipulation attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/123?utm_term=chaos+rings+3+apk PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4454547/normal_5ff11d701577a.pdfIn PDF document text
    • https://zovakobazala.weebly.com/uploads/1/3/1/4/131456363/rigedewajuvedebizeg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479454/normal_60089bc41989f.pdfIn PDF document text
    • https://dugufenejoropez.weebly.com/uploads/1/3/0/7/130775504/melarepusiwif-folebub-fedut-terirasi.pdfIn PDF document text
    • https://titoboxe.weebly.com/uploads/1/3/0/8/130874676/f945b68839fc.pdfIn PDF document text
    • https://fijapirugonobi.weebly.com/uploads/1/3/4/3/134315317/303473.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447450/normal_6013c612221ad.pdfIn PDF document text
    • https://zotawirimatoxo.weebly.com/uploads/1/3/4/0/134096886/03ce732e4c7.pdfIn PDF document text
    • https://nodizolubuta.weebly.com/uploads/1/3/5/2/135297944/6439956.pdfIn PDF document text
    • https://mijevofere.weebly.com/uploads/1/3/1/6/131606011/a628ad0.pdfIn PDF document text
    • https://cdn.sqhk.co/wejuladuke/jhC2thj/jumble_scrambled_word_game_solver.pdfIn PDF document text
    • http://lnstagramcopyrightmanagement.com/grammaire_facile_du_francaisugzhb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472774/normal_600b3a5173544.pdfIn PDF document text
    • https://cdn.sqhk.co/bojowagawire/h3BVjiC/colorpics_sugar_skull_coloring_game_free_download.pdfIn PDF document text
    • https://mututekabifu.weebly.com/uploads/1/3/4/4/134466573/c6c4ec570a.pdfIn PDF document text
    • http://igrarazuma.info/veduwewis97zlr.pdfIn PDF document text
    • http://the-english-temple.com/mighty_sparrow_songs_freeu7fov.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ecae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAE 2900 bytes
SHA-256: b3dfb2f2c41da7350fc3755141d2fd0ea5796bb125df25fec831093623ff73df
font_01_sfnt_off0000f6f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F1 5180 bytes
SHA-256: 762ec0c540d326eb814c64a4cf4c680c5cc024a9a7126feec0edde03504f84ee
font_02_sfnt_off00010887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10887 10656 bytes
SHA-256: f3a7ac588a49874e416c6ef6c17eaff73dc912e0dfde2df67024ea4e2097ecc6

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