Malicious PDF — malware analysis report

Static analysis result for SHA-256 acdbcef866578dc8…

MALICIOUS

PDF

98.8 KB Created: 2021-03-25 12:23:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 4d2a89d71569a28a3b669298bb5df349 SHA-1: c422752aa15a25fcb7b76a863d3f33810d6f6fc5 SHA-256: acdbcef866578dc810c4398e9d425747b84089c0c28617d3e373f41176ed1845
126 Risk Score

Malware Insights

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

The PDF file contains an embedded URI that redirects to a suspicious domain, likely as part of a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm on disposable hosting, further suggesting malicious intent. Although no scripts were explicitly extracted, the presence of external URIs and the ML classifier's high confidence score point towards a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • 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 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://resalured.ru/wix?keyword=ancient+china+laws+and+punishments PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4416675/normal_60160b8c3728b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421767/normal_5fef01396c8ff.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446400/normal_5ff7b8cbe0cb1.pdfIn PDF document text
    • http://nutejujaxi.66ghz.com/sasupavupegonagaso.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443595/normal_6006e24ebdec9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461525/normal_604f126a24f1f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454977/normal_60541ef97d77f.pdfIn PDF document text
    • http://ronifibofizet.medianewsonline.com/lydia_davis_break_it_down.pdfIn PDF document text
    • http://werikipirojenob.scienceontheweb.net/cello_suite_no.1_in_d_by_j.s._bach_guitar.pdfIn PDF document text
    • http://xarusogu.22web.org/year_3_reading_comprehension_worksheets.pdfIn PDF document text
    • http://lomigakorak.getenjoyment.net/31572848247.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413978/normal_60124ef161bb2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476756/normal_605185c10497a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486751/normal_603b6357b9d28.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
    • http://polilofu.onlinewebshop.net/4869321776.pdfIn PDF document text
    • http://wudazebej.atwebpages.com/gisujuxo.pdfIn PDF document text
    • https://s3.amazonaws.com/lanaladu/historia_de_mxico_resumen.pdfIn PDF document text
    • https://s3.amazonaws.com/zuses/8835654359.pdfIn PDF document text
    • http://gorefoverotiw.epizy.com/basic_english_grammar_exercises_for_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/xenavuxa/remover_chamada_de_emergencia_android.pdfIn PDF document text
    • https://s3.amazonaws.com/kuxuxemu/android_p_9._0_features.pdfIn PDF document text
    • http://wuxosalilujaza.atwebpages.com/tinolelo.pdfIn PDF document text
    • https://s3.amazonaws.com/lunojol/cancer_research_uk_information.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AD 19800 bytes
SHA-256: ced6d0a7b3671d6404be1b4dffba08d9d176857322b9136bf2efc06e475100b0
font_01_sfnt_off0001346b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1346B 5068 bytes
SHA-256: 5975b6d696f0fcf980e7898c9d832fcc59871318ef46d2ee193afdaa4a26c58c
font_02_sfnt_off00014582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14582 13408 bytes
SHA-256: 7ae0a700be2b8fe3f914d43422e9a720df363a402378658472995331483e7218
font_03_sfnt_off00016d39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D39 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e