Malicious PDF — malware analysis report

Static analysis result for SHA-256 438b340521f65818…

MALICIOUS

PDF

73.3 KB Created: 2020-03-21 17:13:09 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: b8c5019d37a40f848c9c74bbcfceefda SHA-1: 1ebc86268a68d7ee626f8dba596114be89c06ea9 SHA-256: 438b340521f658187702aff71bf7f26bb33e94de46d1ca146759d96730e35ca8
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The primary URL directs users to a page with the title 'Ejemplo de estilo de negociacion colaborativo', suggesting a lure. The ML classifier strongly indicates maliciousness. The document body is heavily obfuscated and appears to contain repeated URL fragments, reinforcing the link farm behavior.

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://sunriseblendroasters.net/uploads/1/3/0/6/130604993/130604993.html#ejemplo+de+estilo+de+negociacion+colaborativo PDF link annotation
    • http://raychavez.net/uploads/1/3/0/2/130271097/regomanava-lunavopefegukez.pdfIn PDF document text
    • http://therealmommy.com/uploads/1/3/0/4/130483993/demumirobu-wazelijutu-jenexemu.pdfIn PDF document text
    • http://judson96.org/uploads/1/3/0/6/130620280/rigisesovom.pdfIn PDF document text
    • http://coinacadamy.net/uploads/1/3/0/3/130379060/8060651.pdfIn PDF document text
    • http://calculators.software/uploads/1/3/0/3/130379135/zafiridig.pdfIn PDF document text
    • http://smartsheddirect.com/uploads/1/3/0/4/130435544/magoroto.pdfIn PDF document text
    • http://horncomb.com/uploads/1/3/0/5/130590661/tabaset_tomeropo_tizerelexaji_lubaz.pdfIn PDF document text
    • http://elleraewhyte.com/uploads/1/3/0/7/130775049/529d23000278b69.pdfIn PDF document text
    • http://onlytopsaler.site/uploads/1/3/0/8/130814083/nukag.pdfIn PDF document text
    • http://nightlight8000.com/uploads/1/3/0/5/130539125/moxuve.pdfIn PDF document text
    • http://amy-yang.com/uploads/1/3/0/6/130639821/3643890.pdfIn PDF document text
    • http://www.josesalgadoinsurance.com/uploads/1/3/0/4/130483836/5052245.pdfIn PDF document text
    • http://4hxwu.dtmgt.com/uploads/1/3/0/7/130738559/3036ea67c.pdfIn PDF document text
    • http://christopherandrewheathcote.com/uploads/1/3/0/6/130621791/2693002.pdfIn PDF document text
    • http://marijuanacultivationconsultants.com/uploads/1/3/0/3/130323612/7213421.pdfIn PDF document text
    • http://www.monicaariasmiranda.com/uploads/1/3/0/8/130874313/nowilobuk.pdfIn PDF document text
    • http://zenithhse.com/uploads/1/3/0/5/130551726/tebexigategog.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://fedoraproject.org/wiki/Licensing/LiberationFontLicenseIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn 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_off0000d157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD157 11248 bytes
SHA-256: 329f71a242f19b19d9698c47baa384445558e0b243b03c3414de2e15a71854e4
font_01_sfnt_off0000f896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF896 2600 bytes
SHA-256: 41d5c9cb4d60b7530e3cfd93a78efd430fe179aa57a8296e74fb8a971da4b0ee
font_02_sfnt_off000101bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BF 16036 bytes
SHA-256: 779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63

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