Malicious PDF — malware analysis report

Static analysis result for SHA-256 2283fba1388110c5…

MALICIOUS

PDF

50.5 KB Created: 2020-03-19 11:05:39 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-07
MD5: 8605613cabf8b496b0a7499acb1bede2 SHA-1: ddf4c8591d73d3a53be25b48b88ab2d234785e5e SHA-256: 2283fba1388110c5ee6a572234e98c21021f9aa9088f4d03f93f97d0d19627b6
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links to other PDF files hosted on various domains, suggesting a link farm or redirection scheme. The heuristic 'PDF_SEO_LINK_FARM' indicates this is a deliberate attempt to create a network of SEO-optimized PDFs. The embedded document body text, though partially corrupted, contains metadata and a reference to '2+3-dimethylbutane boiling point', which appears to be a keyword used to generate these SEO-optimized links. No scripts were extracted from this sample.

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://kohno-corp.com/uploads/1/3/0/7/130739122/130739122.html#2+3-dimethylbutane+boiling+point PDF link annotation
    • http://philadelphiahouse.net/uploads/1/3/0/2/130272511/6768928.pdfIn PDF document text
    • http://coilingdragonkungfu.com/uploads/1/3/0/3/130313024/aeeb591c2.pdfIn PDF document text
    • http://workingmomdoesmakeup.com/uploads/1/3/0/8/130813618/04c545de0.pdfIn PDF document text
    • http://exceladept.com/uploads/1/3/0/2/130272902/5863826.pdfIn PDF document text
    • http://www.just10.biz/uploads/1/3/0/4/130476168/f36467bacc88.pdfIn PDF document text
    • http://killthecat.com/uploads/1/3/0/5/130550844/ecd8b.pdfIn PDF document text
    • http://vivianmaierfoundation.com/uploads/1/3/0/4/130435914/93468f2.pdfIn PDF document text
    • http://timeofmagic.com/uploads/1/3/0/3/130379412/vunelivisesikiv.pdfIn PDF document text
    • http://cashmerecanada.ca/uploads/1/3/0/4/130436207/8644428.pdfIn PDF document text
    • http://www.arizonamusicproject.com/uploads/1/3/0/2/130272506/778a0d0.pdfIn PDF document text
    • http://driversedgrades.com/uploads/1/3/0/6/130639926/babusutomelokonak.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicenseIn PDF document text

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000080e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80E2 6496 bytes
SHA-256: 5799fb81e261f6dd50ff9b503e85c44e438542e2bf8c8893756d066a073750d7
font_01_sfnt_off000090dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x90DD 8748 bytes
SHA-256: fb4d79bd31de0319ba46263267f1f89205146a96fca56951576b6cf3eb3aa248
font_02_sfnt_off0000b264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB264 2704 bytes
SHA-256: cd5b04feeae1aab24d32ec675b888b21b71c4a17e467ce630bfa86e07139397e

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