Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c840f1fc3578790…

MALICIOUS

PDF

79.4 KB Created: 2021-03-28 02:05:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 61897df2ebbec67c8b1c626b7f8f66e1 SHA-1: 47e3f0fca1b37668c369d326ae07bb1a891dd6ad SHA-256: 2c840f1fc3578790709b73dcbc0f749b6c3296db1ec4ead5e826780bd30cfd19
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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 0.9993

Heuristics 7

  • 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.
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://lozipotod.ru/award?keyword=online+translator+pdf+to+word PDF link annotation
    • http://redita.fun/a_simple_favor_netflix_philippines73db8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369149/normal_6056e2a02ac14.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373508/normal_6047a88d69893.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384145/normal_5fe589aae0847.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453885/normal_601b371e45474.pdfIn PDF document text
    • http://namelesssouth.xyz/41202082203ad7nr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465709/normal_603d4409dab55.pdfIn PDF document text
    • https://babipuwoze.weebly.com/uploads/1/3/4/8/134865032/rudufafaxe.pdfIn PDF document text
    • http://neditaxuvim.getenjoyment.net/mathematical_analysis_and_its_inherent_nature.pdfIn PDF document text
    • http://wuxetij.mypressonline.com/lulakidiris.pdfIn PDF document text
    • http://salearea.pro/toteruxef6bdd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459320/normal_5fe44e5a8a925.pdfIn PDF document text
    • http://vseti.life/80114976137xglta.pdfIn PDF document text
    • https://pivorexivasij.weebly.com/uploads/1/3/4/4/134489734/2585043.pdfIn PDF document text
    • http://ig-supportcenter.xyz/rosaura_a_las_diez_chapter_5_summary66te0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427783/normal_5fda01724535f.pdfIn PDF document text
    • https://tubozabuzimez.weebly.com/uploads/1/3/4/8/134878922/nunanimabomefuzog.pdfIn PDF document text
    • http://tanijijud.sportsontheweb.net/bams_2_year_syllabus.pdfIn PDF document text
    • https://telamuvepof.weebly.com/uploads/1/3/1/3/131381447/4e5b9cd.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/bidivo/dajomoriweta.pdfIn PDF document text
    • https://s3.amazonaws.com/rezugekolaba/983932641.pdfIn PDF document text
    • https://s3.amazonaws.com/kozibowisenatu/confidential_litigant_information_sheet_new_jersey.pdfIn PDF document text
    • https://s3.amazonaws.com/firudegix/lutupuvevipifekagowuji.pdfIn PDF document text
    • https://s3.amazonaws.com/gumagabu/black_panther_trailer_background_music.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_off0000f984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF984 5156 bytes
SHA-256: d50996c2e1aa5854a94fcab15960585af4e6c7b313802cba57a7c340a047d92b
font_01_sfnt_off00010b2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2A 11016 bytes
SHA-256: d52a89391778e87aef7b9bdd67b03d60d5c8c5b8f2591724cd364bb284335422