Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebf983496b386ac2…

MALICIOUS

PDF

31.3 KB Created: 2020-04-17 07:49:59 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: a0e9aef27bbc9212ecb505c13c8ba353 SHA-1: e558584bd1f9f1024c1ed2c4d43f228a7f9be113 SHA-256: ebf983496b386ac233133b6d68eb9f6660580631080dd6041bbe6a0722c2c582
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML_NYX_PDF_MALICIOUS classifier also flagged the file with high confidence. The embedded URLs point to a network of sites that appear to be part of a link farm, suggesting a potential SEO spam or content distribution scheme. No scripts were extracted from this sample, limiting the ability to determine a specific payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://dwyercabinetry.com/uploads/1/3/1/4/131438275/131438275.html#botim+for+android+4.+0.+3 PDF link annotation
    • http://timothypettet.com/uploads/1/3/0/4/130488241/zajigifunesa_veraxawudo_rizinatawipib.pdfIn PDF document text
    • http://eftandyou.com/uploads/1/3/0/2/130288909/4184572.pdfIn PDF document text
    • http://callawayrealestate.org/uploads/1/3/0/4/130436209/35a3edfa05806.pdfIn PDF document text
    • http://joyfulspiritchurch.org/uploads/1/3/0/2/130289426/joseki.pdfIn PDF document text
    • http://thisgiftedlife.com/uploads/1/3/0/7/130775371/xavojudewuku.pdfIn PDF document text
    • http://rockyjohnsonlaw.com/uploads/1/3/0/4/130483980/jutolar.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

Related samples 3

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

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4979 7728 bytes
SHA-256: a294ed0f4ebdb4614a6a9506011fc61b9a2c52ffb6b81ee000e68c18b8363520
font_01_sfnt_off000067d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67D5 1960 bytes
SHA-256: 8bdbc4fa0660802d1c4200059c153e98eb919eb40fd02047fcf25abf6a6cd36c

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