Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb7a946f95af7485…

MALICIOUS

PDF

143.6 KB Created: 2021-03-17 18:43:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 89076cb5e67d8e97f86bf2884724d737 SHA-1: 8bfca63112a5638b815d444f0548968ab015c0fc SHA-256: eb7a946f95af748510166ca21f74660374937e404b07d64d903986f89bda193a
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URIs point towards a tactic of directing users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/strik?utm_term=03+jeep+liberty+owners+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4459322/normal_6051f16ef1c25.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383915/normal_5fde86ce409be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447093/normal_6031694b42087.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487005/normal_60175d6b01f26.pdfIn PDF document text
    • http://lasleymarkt.ru/hunger_games_3_english_subtitlesaezzv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484122/normal_5fd97602f2665.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372101/normal_6030f95c30760.pdfIn PDF document text
    • https://daradila.weebly.com/uploads/1/3/1/4/131438164/dogojiboti_rutumate.pdfIn PDF document text
    • https://givodevivunafa.weebly.com/uploads/1/3/1/8/131871579/193a4a175b1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486983/normal_5ff88f86866d7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423780/normal_5fcedeb4527e9.pdfIn PDF document text
    • https://kitigenuripoduj.weebly.com/uploads/1/3/1/0/131070171/b449f99.pdfIn PDF document text
    • http://dutov.org/samsung_refrigerator_rs261mdrs_manuaqf5x0.pdfIn PDF document text
    • http://masito.space/nukonewurizikex4q15n.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380070/normal_5fc8aab0aa185.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5359e5b-80d7-4f24-8e90-506ed119e9fe/freelance_storyboard_artist_sydney.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33189995-2d76-4218-9b61-32752a86c456/50852541726.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/677fc5da-ead7-4811-9213-a86642173208/xenolajuzevox.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001ca6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CA6C 5584 bytes
SHA-256: 8990a104797386ac42c70ddf81a59c351e32c610d93e7cf769cdb820d41ffcf4
font_01_sfnt_off0001dd58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DD58 7716 bytes
SHA-256: 4ce3fc7d5837da7129642fdae4f3203ccceca7850a7016ad74d75932eb574f83
font_02_sfnt_off0001f2bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F2BD 11656 bytes
SHA-256: 74b3062a36a4e79c70525b17631aa99838b3b4b4e58a0c4a08ce0b1bba0a6468
font_03_sfnt_off00021abf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21ABF 16092 bytes
SHA-256: 7481e981f4cb77b4eee6a3bc35adde57450ad59ad21629f895c49a280468cbf2