Malicious PDF — malware analysis report

Static analysis result for SHA-256 09f4de7c411b8737…

MALICIOUS

PDF

80.3 KB Created: 2021-04-15 10:41:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 1308791e41165634340200965f8af900 SHA-1: 46b612a4ee06c31ff1d2da30fa3310534741a347 SHA-256: 09f4de7c411b87379c3e7b2505467c61998dd46c3b6418e631111bbe50620441
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many of which point to disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of external URIs and a link farm heuristic points to an attempt to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://zajinet.ru/strik?utm_term=who+makes+magic+chef+fridge PDF link annotation
    • http://hightrade.club/zumijef9hogu.pdfIn PDF document text
    • https://nebobaxewakizix.weebly.com/uploads/1/3/1/6/131637309/pavavevaxudov.pdfIn PDF document text
    • http://brosbass.com/wumugekkgi3w.pdfIn PDF document text
    • http://pubggaming.online/67689290741kvtv9.pdfIn PDF document text
    • http://boothattendant.com/79269220315xlp4n.pdfIn PDF document text
    • https://vetolotex.weebly.com/uploads/1/3/1/3/131379132/kufoloso.pdfIn PDF document text
    • https://tewijudejasivi.weebly.com/uploads/1/3/2/6/132682467/badip.pdfIn PDF document text
    • https://waxalema.weebly.com/uploads/1/3/4/3/134364729/zelenite.pdfIn PDF document text
    • https://xuvelusikifaza.weebly.com/uploads/1/3/1/4/131406656/biteregalipi_ledulaxebejupi_devap.pdfIn PDF document text
    • https://vemideluguzuni.weebly.com/uploads/1/3/4/6/134680431/85bc3a030f4.pdfIn PDF document text
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • https://zuzesewijolane.weebly.com/uploads/1/3/1/4/131406438/5854610.pdfIn PDF document text
    • https://fawurefo.weebly.com/uploads/1/3/4/4/134441885/ririzopolobe_zexipu_zibosizemex.pdfIn PDF document text
    • https://vodefuba.weebly.com/uploads/1/3/4/6/134688083/9026762.pdfIn PDF document text
    • https://jobovivubip.weebly.com/uploads/1/3/5/3/135392816/d6f0a6.pdfIn PDF document text
    • https://jinogujejimitad.weebly.com/uploads/1/3/5/3/135392391/2a74a1e.pdfIn PDF document text
    • https://lomofoxagut.weebly.com/uploads/1/3/4/5/134524577/temazobigizara_sirop.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/446a9213-8fc9-46f6-8c0d-83667110140d/what_does_blinking_light_on_router_mean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b801296f-09b3-4ecb-8ce3-9559e768316e/palaxovufikelomekuzeduver.pdfIn PDF document text
    • https://s3.amazonaws.com/jarawaxanivu/24559063512.pdfIn PDF document text
    • https://s3.amazonaws.com/zowibatev/agenda_2019_excel_template.pdfIn PDF document text
    • https://s3.amazonaws.com/julaxel/how_to_listen_effectively.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10f895ec-6510-43be-a0dc-fc9b76c95720/parallel_lines_worksheet_answers.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE55 5084 bytes
SHA-256: 6cbe196a020aa5b707f9f18854f7bb05651e37e2886da555d0c43bd3bb58a0bf
font_01_sfnt_off0000ffa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA1 10732 bytes
SHA-256: 731ccf8128c3f6c7133d470ea4e895508824fde97968610667e68190cb2e372e
font_02_sfnt_off00012448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12448 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378