Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e7ba2713c83c1aa…

MALICIOUS

PDF

74.6 KB Created: 2021-05-12 15:02:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 81b25bbaf036109633c431037a203556 SHA-1: cdad65d055e5f4f0916ef1eececb7af8e36cae4d SHA-256: 5e7ba2713c83c1aaa390a6044fa6410bd01c057c67d161ed8ed1294d1db2fbac
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9996

Heuristics 5

  • 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://fokemale.ru/strik?utm_term=tp+link+wr841n+vpn+setup PDF link annotation
    • http://sayfelengs.space/vamexofavewalusubiqzw5r.pdfIn PDF document text
    • http://psyhologrzn.ru/647293514594zd43.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476126/normal_6033028504e2b.pdfIn PDF document text
    • https://cdn.sqhk.co/sivojadirabe/ugiGGhi/i_will_touch_base_with_you_in_spanish.pdfIn PDF document text
    • http://nuxuxavolas.22web.org/compassionate_appointment_application_form_for_tamilnadu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492286/normal_60341af42578c.pdfIn PDF document text
    • https://cdn.sqhk.co/xederebat/d3jhVib/bogagexu.pdfIn PDF document text
    • https://cdn.sqhk.co/xadeviro/hihfgxR/89189197902.pdfIn PDF document text
    • http://busurman.space/zujixogomonela90c6a.pdfIn PDF document text
    • http://tizuwaborew.22web.org/aditya_hridaya_stotra_in_marathi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459787/normal_5ff1b022d4664.pdfIn PDF document text
    • https://cdn.sqhk.co/remonupode/aBHpKgc/subixatesoror.pdfIn PDF document text
    • http://instacopyrighthelpteam.com/statistics_for_the_life_sciences_4th_editionxvn0p.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xeropizuwe/apa_format_autobiography_example.pdfIn PDF document text
    • https://s3.amazonaws.com/lovomijelun/felixibixin.pdfIn PDF document text
    • http://rufolexuvolup.epizy.com/game_despicable_me_2_mod_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/gidibesuxi/tojejozevetir.pdfIn PDF document text
    • https://s3.amazonaws.com/woberiz/17392397202.pdfIn PDF document text
    • http://genovadeni.epizy.com/vocabulary_about_family_worksheet.pdfIn PDF document text
    • http://gofosuxubajo.epizy.com/chuchu_tv_free_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/jasipefulaxiduj/93978057748.pdfIn PDF document text
    • http://mezubivedoxida.epizy.com/dulizipiseseremume.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_off0000e88a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE88A 5104 bytes
SHA-256: 664cedae1e5cfc1c86f0e13caf13934b22daab4c22a6efb8e078601ddafc88fe
font_01_sfnt_off0000fa1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1C 10296 bytes
SHA-256: 74170a547cd7b7078cea3d9d08edddb624b1b9ed2e7c5eeae9345e09a06e5eb3

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