Malicious PDF — malware analysis report

Static analysis result for SHA-256 e472fb1efc1246ca…

MALICIOUS

PDF

74.9 KB Created: 2021-06-09 20:27:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 50b5c3bb2deef9ee71056f9e889cf11a SHA-1: 4d2151f9db65ff5795ddfe2df0ff5e5cd7caa4fb SHA-256: e472fb1efc1246ca0084030abe4a3e145f19ab39c81302e50416de69d76a0025
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating phishing and potential trojan activity. It contains numerous external links, suggesting a link farm or redirection mechanism. The embedded URL 'https://oniceh.ru/wb?keyword=amelia%20bedelia%20book%20online' indicates a lure related to book searches, likely to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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
  • 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://oniceh.ru/wb?keyword=amelia%20bedelia%20book%20online
    • https://static.s123-cdn-static.com/uploads/4413982/normal_5fe2bd7f77e7e.pdf
    • https://cdn-cms.f-static.net/uploads/4476936/normal_60b86d6021193.pdf
    • https://cdn-cms.f-static.net/uploads/4477638/normal_601edc549721d.pdf
    • https://cdn-cms.f-static.net/uploads/4412757/normal_606ae045bfd08.pdf
    • https://fozikubovofow.weebly.com/uploads/1/3/4/8/134897471/58ecae02.pdf
    • https://cdn-cms.f-static.net/uploads/4453332/normal_60613322e7d10.pdf
    • https://static.s123-cdn-static.com/uploads/4377663/normal_5fe2e991890b6.pdf
    • https://ginekimef.weebly.com/uploads/1/3/0/7/130738874/30544dbda.pdf
    • https://cdn-cms.f-static.net/uploads/4459631/normal_6038586238994.pdf
    • https://sibinepenisux.weebly.com/uploads/1/3/4/4/134467302/biviral-lefetoxogamexa.pdf
    • https://cdn-cms.f-static.net/uploads/4443325/normal_600e86962fa14.pdf
    • https://devejibotabakap.weebly.com/uploads/1/3/4/7/134702496/dobosik.pdf
    • https://cdn-cms.f-static.net/uploads/4465949/normal_6041b0a2e9740.pdf
    • https://cdn-cms.f-static.net/uploads/4406789/normal_600ea729ed0a0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/7f61119d-d14a-487a-88c3-fe241210f506/48252938358.pdf
    • https://uploads.strikinglycdn.com/files/2e30186d-a1e7-4edf-949c-483fd79f6768/emma_zunz_analisis_prezi.pdf
    • https://uploads.strikinglycdn.com/files/331511d3-7c46-4aae-a10b-30b3d12115e6/how_to_change_battery_on_barska_safe.pdf
    • https://uploads.strikinglycdn.com/files/6be0f2a4-a949-4b23-b28c-d0c9d4bf2776/28753225151.pdf
    • https://uploads.strikinglycdn.com/files/2149773d-37e4-40c7-b91b-c9aa70fb40c2/bernina_record_830_foot_pedal.pdf
    • https://uploads.strikinglycdn.com/files/4d579c7c-d1b6-4352-a5e1-a4cf878d2178/60621841255.pdf
    • https://uploads.strikinglycdn.com/files/09762765-c4af-4708-b558-fd1823895ce0/71107276252.pdf
    • https://uploads.strikinglycdn.com/files/7acbda14-fcc8-4f97-8f7e-9cdeca620338/68524547788.pdf
    • https://uploads.strikinglycdn.com/files/df39dd17-5d5c-437e-8b2a-8cd2be37ee00/77747264209.pdf
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9ca.bin
236cf774c57c99f8fdd5df1e62501855079f614b7e05ef9c48961d765b546213
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CA 4892 bytes
font_01_sfnt_off0000fa58.bin
f2ef732df95331aef26bccf6774677da1edf0ea0c0f82b424d637b6d589f8c3c
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA58 10640 bytes