Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3d52c9fc3bf7042…

MALICIOUS

PDF

45.0 KB Created: 2020-06-05 02:12:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: bf5b20fdbea44c3e50da3d90f3009bf6 SHA-1: 0ba6e398793b854d2bd9427eb4dba65e0771d020 SHA-256: d3d52c9fc3bf70421003d61aa518f01cc18dcfb26c037438552f11d57185e433
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links to various domains, many of which follow a similar structure suggesting a link farm. The ML classifier strongly indicated maliciousness. The primary purpose appears to be directing users to a network of potentially compromised or malicious websites, as evidenced by the PDF_SEO_LINK_FARM heuristic and the numerous embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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 http://muellerwood.works/uploads/1/3/1/1/131164211/131164211.html#aniflv+naruto+chipuden PDF link annotation
    • http://bassettfurnituresuperstore.com/uploads/1/3/0/6/130639397/nagolovupufazetizo.pdfIn PDF document text
    • http://herohome.biz/uploads/1/3/0/6/130620228/bikurugopusun.pdfIn PDF document text
    • http://petejbilling.com/uploads/1/3/0/8/130814749/d1e791528afc44.pdfIn PDF document text
    • http://facultyretreat.org/uploads/1/3/1/4/131438610/sumuvejezoto-tedosa.pdfIn PDF document text
    • http://cartersconsulting.com/uploads/1/3/1/6/131636777/zinanuri-sesijekixubi.pdfIn PDF document text
    • http://aaplex.com/uploads/1/3/0/7/130775434/duwuzifabofob_gejapuliwa_taruwulugajelo.pdfIn PDF document text
    • http://chairrecovery.com/uploads/1/3/0/8/130813063/2252775.pdfIn PDF document text
    • http://winonabowl.net/uploads/1/3/1/4/131437980/1655916.pdfIn PDF document text
    • http://muellerwood.works/uploads/1/3/1/1/131164211/terms.htmlIn PDF document text
    • http://muellerwood.works/uploads/1/3/1/1/131164211/dmca.htmlIn PDF document text
    • http://muellerwood.works/uploads/1/3/1/1/131164211/policy.htmlIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://kegitefivoxu.files.wordpress.com/2020/06/zozaja.pdfIn PDF document text
    • https://sigutobe.files.wordpress.com/2020/06/xerigurokudufaxakeleb.pdfIn PDF document text
    • https://tejunif.files.wordpress.com/2020/06/405031621.pdfIn PDF document text
    • https://jenurozogu.files.wordpress.com/2020/06/84239063715.pdfIn PDF document text
    • https://pemaguw.files.wordpress.com/2020/06/25820974606.pdfIn PDF document text
    • https://wuniliruk.files.wordpress.com/2020/06/fedutirid.pdfIn PDF document text
    • https://nojowijede.files.wordpress.com/2020/06/nixaxalapivadoz.pdfIn PDF document text
    • https://xidedikef.files.wordpress.com/2020/06/molipimewaloduwokotuno.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

Related samples 2

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000074db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74DB 22132 bytes
SHA-256: febf5ef3018cecf2aa0c4a853a3a2e804b263a9beaef45ef8b990ccbb2a99ff9

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