Malicious PDF — malware analysis report

Static analysis result for SHA-256 eef650fdc283f6f4…

MALICIOUS

PDF

70.7 KB Created: 2021-03-15 17:58:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 70da5fccb9069699778d746ed5c3b479 SHA-1: dcffc8150cce9f46af120397188b5778e75e9ac4 SHA-256: eef650fdc283f6f40de4888ac545db15815bf152e450df00c37e3e4e99e2d2b0
156 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a link farm or SEO spam, embedding a large number of external links to other PDF documents. The primary URL, 'https://bologen.ru/wix?keyword=biblia+de+estudio+thompson+descargar+gratis+pdf', suggests a lure related to downloading study Bibles. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to distribute further malware or engage in phishing. No scripts were extracted, but the sheer volume of embedded links points to a distribution or redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/wix?keyword=biblia+de+estudio+thompson+descargar+gratis+pdf
    • https://cdn.sqhk.co/pevukoza/Ujg2hga/xomupexomadisaruxijufokon.pdf
    • https://cdn-cms.f-static.net/uploads/4492901/normal_5fd969f6d7e4e.pdf
    • https://pedexanagokol.weebly.com/uploads/1/3/4/6/134635549/1879353.pdf
    • https://cdn-cms.f-static.net/uploads/4489251/normal_601fd690eaa5c.pdf
    • https://cdn.sqhk.co/fiporalisu/H6gGjh6/basic_business_plan_format.pdf
    • https://cdn.sqhk.co/jogepirar/MGMiaia/56101912714.pdf
    • https://cdn.sqhk.co/bupabumo/ggw4Hhd/vibipapedadudewik.pdf
    • https://cdn.sqhk.co/fofotixoz/63GhtYk/moxapulonetodokebamubomo.pdf
    • https://cdn-cms.f-static.net/uploads/4479439/normal_60116f0386d25.pdf
    • https://cdn-cms.f-static.net/uploads/4420765/normal_604d0acb22d05.pdf
    • https://runumoviw.weebly.com/uploads/1/3/4/8/134854062/4264101.pdf
    • https://cdn-cms.f-static.net/uploads/4473322/normal_604a24f0788cf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://02408c19-b9f6-4996-a596-1d5b7e46c8d3.filesusr.com/ugd/c83fdb_8f4efc8719434b91b3e9405ab82627e8.pdf?index=true
    • https://s3.amazonaws.com/dubiditiginowo/khatrimaza_bollywood_movies_2018_mkv.pdf
    • https://s3.amazonaws.com/bededuxotulapil/29716451639.pdf
    • https://s3.amazonaws.com/pusixa/30158400402.pdf
    • https://s3.amazonaws.com/kitakilesa/binomische_formeln_ben_klasse_8.pdf
    • https://b7eb3c74-9f10-4efd-a612-efb7ea03662f.filesusr.com/ugd/7198c1_8562c32ee4af475b8879cb698fc9ff7f.pdf?index=true
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c7da.bin
d3c2a84be682ed199f94da04f8e6baeccf2a29afd6241d3fbbc544299db4d8d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC7DA 5640 bytes
font_01_sfnt_off0000dad0.bin
997e7ec805949fae2c3e01711e07542f381d464891fc3b639743060a8b6aa07e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD0 10964 bytes
font_02_sfnt_off0000ff54.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF54 4324 bytes

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