Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e418a75ac8e7858…

MALICIOUS

PDF

75.0 KB Created: 2021-02-22 22:42:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 7016fd0e0a8f51fd8938216d89f673e4 SHA-1: 404350dc198bf405ea895aaf803a949959d59bba SHA-256: 4e418a75ac8e7858f8597430a6b556727d2c53cd5b41222dc515cf5ccf72c8c9
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, identified by the 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics, suggesting it is designed to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of external URIs and a link farm points towards an attempt to lure users to compromised or malicious domains.

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://crophysi.ru/strik?utm_term=c+language+printf+hex+format PDF link annotation
    • https://cdn.sqhk.co/pimidima/WjeY0DG/how_to_raise_a_smart_child_book.pdfIn PDF document text
    • http://nicechange.space/how_much_does_laptop_hinge_repair_cost9njav.pdfIn PDF document text
    • https://cdn.sqhk.co/vasozaponem/chdOgj8/nanofupan.pdfIn PDF document text
    • https://zenavepofiwu.weebly.com/uploads/1/3/1/6/131607810/e0b1b.pdfIn PDF document text
    • http://terubib.22web.org/paloma_water_heater_code_p1.pdfIn PDF document text
    • https://tererenigi.weebly.com/uploads/1/3/1/4/131405956/4949853.pdfIn PDF document text
    • https://pinowutofabu.weebly.com/uploads/1/3/4/7/134763632/nofasuxos.pdfIn PDF document text
    • http://fallofelin.online/voice_changer_recorder_app_apknlp54.pdfIn PDF document text
    • http://gufutaca3.xyz/luzawepowenokat2lijb.pdfIn PDF document text
    • http://telemprom.xyz/58731853829kr7fc.pdfIn PDF document text
    • https://cdn.sqhk.co/sonometa/dmPqgfw/easy_launcher_for_seniors.pdfIn PDF document text
    • http://procripton.com/conjugacion_de_verbos_en_latindntpt.pdfIn PDF document text
    • https://cdn.sqhk.co/xotalawad/33gjO3G/zakurezidarigoxifagi.pdfIn PDF document text
    • https://cdn.sqhk.co/mixubiki/ii6igjg/netflix_dvd_plan_sign_in.pdfIn PDF document text
    • https://cdn.sqhk.co/noviraxat/dBja1gj/pafuwolosavu.pdfIn PDF document text
    • https://tetokanituxur.weebly.com/uploads/1/3/4/5/134523616/8174882.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dipibezepipes.rf.gd/halloween_coloring_worksheets.pdfIn PDF document text
    • http://rupilozomu.epizy.com/what_does_lo_amo_mean.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_off0000e727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE727 5112 bytes
SHA-256: 76d2e2ff317819faee228cf4d02ee9235b352739917448c3f8e6f4c48264571c
font_01_sfnt_off0000f869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF869 11288 bytes
SHA-256: 9999ca291946e71779adb36aaaa53dab7f7baa83751e5586444828c57cf7a828

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