Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb4987306577eb05…

MALICIOUS

PDF

79.1 KB Created: 2021-02-21 07:41:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: c74967c682390699fa9e843e06749d2f SHA-1: ae201b5931c6db78756fd234ed750f6d4fd9b5b1 SHA-256: bb4987306577eb05305a4d797e300b5767708e3912167f6d2e3a1e58d149e569
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://baarspo.ru/strik?utm_term=aa+step+2+working+guide PDF link annotation
    • https://kufidadifijerid.weebly.com/uploads/1/3/1/4/131407945/1a57d.pdfIn PDF document text
    • http://tb-films.ru/sad_wallpapers_for_chromebookgqmxb.pdfIn PDF document text
    • http://fitit.space/jefatowetixedofoseronagaoe3rr.pdfIn PDF document text
    • https://zofoxutugutijor.weebly.com/uploads/1/3/0/8/130874595/2051214.pdfIn PDF document text
    • https://wabiwuwisurukim.weebly.com/uploads/1/3/2/6/132682822/zuwimukavi.pdfIn PDF document text
    • https://kaxorude.weebly.com/uploads/1/3/4/0/134095875/a4a58be3be4b.pdfIn PDF document text
    • https://soxexovefulobi.weebly.com/uploads/1/3/1/4/131484328/kakobexosovurumu.pdfIn PDF document text
    • https://rowopubogapog.weebly.com/uploads/1/3/4/2/134234702/borawagodiputazoreg.pdfIn PDF document text
    • https://zofudugopevemob.weebly.com/uploads/1/3/1/6/131607066/8858368.pdfIn PDF document text
    • http://construt.site/gigeninaziduwi6dapu.pdfIn PDF document text
    • https://nibolujadi.weebly.com/uploads/1/3/1/3/131381302/sujifakekak_nodisosa_zetovowafegu.pdfIn PDF document text
    • http://trokot-shtorki.online/19270595972n3e9s.pdfIn PDF document text
    • https://wugeneziwepuzi.weebly.com/uploads/1/3/4/4/134494794/51546325a2.pdfIn PDF document text
    • http://neojust.ru/wotopaxuki5wv.pdfIn PDF document text
    • https://ruwadegefanum.weebly.com/uploads/1/3/4/1/134108857/rebijam-zoxisoz-biwakisem-xukarinike.pdfIn PDF document text
    • https://wilivaja.weebly.com/uploads/1/3/2/6/132682565/9441336.pdfIn PDF document text
    • https://kovajokuluvemu.weebly.com/uploads/1/3/5/3/135335912/bitilu.pdfIn PDF document text
    • http://instapriz24.site/wuxaduxufu91ql3.pdfIn PDF document text
    • http://itabody.space/direct_and_indirect_characterization_worksheet_answers4k6y0.pdfIn PDF document text
    • http://wordwild-store.com/2003_chevy_avalanche_1500_owners_manuals4uj9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/zugutixe/geico_insurance_card_template_form.pdfIn PDF document text
    • https://s3.amazonaws.com/dosalapasenow/jeepers_creepers_4_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/kufazete/rosinaxeraleto.pdfIn PDF document text
    • https://s3.amazonaws.com/genedesowul/skype_for_windows_desktop_7._3.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_off0000ec4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4A 5256 bytes
SHA-256: 9031fcb987a240c73e17ca5bbf9d9b15c974050c51f2c52b63cf88eb3ef2c54f
font_01_sfnt_off0000fe4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4E 10216 bytes
SHA-256: 035521878b8246dd560f5382eb02383327cc2f58e12aecb22655d58e984a528d
font_02_sfnt_off0001210d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1210D 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378