Malicious PDF — malware analysis report

Static analysis result for SHA-256 06c558e5751b87af…

MALICIOUS

PDF

82.3 KB Created: 2021-05-01 15:59:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ecee73faa2a5b1e37d8ccba75ab44716 SHA-1: d6524c9ff3465207acbdafb60086589a8f4ccfb9 SHA-256: 06c558e5751b87af64ef05fd602d0058104bc0d4cde8086b211b85cc2251388a
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, a technique often used to distribute phishing content or redirect to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple external URIs and a link farm heuristic further supports this, suggesting the PDF is designed to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • 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 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://seumenha.ru/strik?utm_term=fundamentals+of+construction+project+management+pdf
    • http://vashastrahovka24.ru/wikapavosasoresekaguvo7yjuc.pdf
    • http://temppicture.xyz/rilitazujiteselonifegosuxuie7m.pdf
    • http://g2am2e.xyz/110310520cvylj.pdf
    • http://bosnoslovnoejelaniekupit.xyz/6057062581mz13g.pdf
    • https://rudunusom.weebly.com/uploads/1/3/4/6/134602981/6267293.pdf
    • http://selomankap.space/leading_edge_demolition_tucsonhzche.pdf
    • http://accueilcmb.com/am_pm_to_24_hour_formatezu7s.pdf
    • http://avto-trokot.xyz/ejemplo_de_memorandum_por_inasistenciar9da4.pdf
    • http://kdghy.online/mec-gar_ruger_p95_17_round_magazinepkiub.pdf
    • https://tazusovekofuwaj.weebly.com/uploads/1/3/5/9/135969448/c48f829169276.pdf
    • https://duzuxaxopukuka.weebly.com/uploads/1/3/4/6/134615532/2043485.pdf
    • https://sekilulijafos.weebly.com/uploads/1/3/1/4/131438177/7629192.pdf
    • http://sallehub.xyz/weber_smokey_mountain_cooker_18_inch_smoker_reviewsnry5i.pdf
    • https://zofoneparadi.weebly.com/uploads/1/3/5/3/135341866/b4f09de087de5e.pdf
    • http://eurofamily.pro/uc_browser_apk_old_version_2020y4rzk.pdf
    • https://linekepev.weebly.com/uploads/1/3/4/0/134041162/rikokatij_ninesupikapuj_runewetixele_bivewegifuba.pdf
    • https://somirurawepaf.weebly.com/uploads/1/3/1/3/131381963/8676255.pdf
    • http://5coupon.info/toyota_avensis_verso_2005_manualurv3s.pdf
    • http://yblda.fun/bugaboo_cameleon_seat_manualu26j1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://1ae094b9-110d-4377-a83c-911b29edd90d.filesusr.com/ugd/d5eada_fdeb46258069403ca754004b94848cce.pdf?index=true
    • https://0502d5d0-a0f5-47b8-bc1c-644c46e4e431.filesusr.com/ugd/6cabbb_6a20e1524c644271b20d94f81245d931.pdf?index=true
    • https://551f0ad2-75d1-4009-b90b-2f3e3e20230b.filesusr.com/ugd/c2bf0a_61608b5a0d814100b33dba70d23dc2cf.pdf?index=true
    • https://a9d1d3ec-13fa-4b7e-abe1-abe2c2ba1301.filesusr.com/ugd/f83029_222bce4e9dbb41e8987dd542a3541862.pdf?index=true
    • https://968bac2e-1409-45a7-bd11-2c37eba47390.filesusr.com/ugd/c81504_ba144e14beae40cd9cc18c075433ae95.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3a1.bin
b0ec114ebdf0b5f9c21012dd4c92e90ce87a4b05fc7eb172b3d7c9858d3529c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A1 5388 bytes
font_01_sfnt_off000105df.bin
4dd74890084944f38dd4b169331896f7f63797d6d91fa39f0a651824944d7236		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105DF 11932 bytes
font_02_sfnt_off00012ca6.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12CA6 4324 bytes

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