Malicious PDF — malware analysis report

Static analysis result for SHA-256 f698b56781d6916c…

MALICIOUS

PDF

42.8 KB Created: 2020-03-30 07:25:03 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e7e7dd17dbe73a4939f1ad8fc1b22cd0 SHA-1: af91b55beb2ea7446216609c4e31536879960b06 SHA-256: f698b56781d6916ce7a3486e7c2c3d7112f8ad8f24c2601f2b8f719af399fbbc
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The document body, though partially obfuscated, includes a title related to the nervous system and references wkhtmltopdf, suggesting it's a generated document. The primary attack pattern appears to be SEO spam or a link farm, directing users to potentially malicious or unwanted content via the embedded URLs. 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://74-123-73-55.mgwnet.com/uploads/1/3/0/6/130603818/130603818.html#resumo+sistema+nervoso+anatomia+humana
    • http://nevrapoint.com/uploads/1/3/0/9/130969166/6735213.pdf
    • http://www.semaiearts.fr/uploads/1/3/0/6/130621852/lagugivudegu-jebexepazaxutut-jikerob.pdf
    • http://mygelotti.com/uploads/1/3/0/6/130620731/fikarixenetumem-fovutelaj.pdf
    • http://lakegenevawinterbridalexpo.com/uploads/1/3/0/6/130605238/9e45f64f1d8f225.pdf
    • http://greencleanservicesinc.org/uploads/1/3/0/6/130621418/941276.pdf
    • http://frshow.com/uploads/1/3/0/2/130272934/potapupuxos_lifuvi.pdf
    • http://stepnup.net/uploads/1/3/0/8/130813489/9492529.pdf
    • http://asperaarchitects.co/uploads/1/3/0/5/130539432/61c103f0.pdf
    • http://vintage-guitar.net/uploads/1/3/0/3/130324158/zisofivewigub-wawilabivobir.pdf
    • http://mckinleyathletics-hi.com/uploads/1/3/1/3/131384555/zijug_ferufopezug_ginaxelifusan_febujunod.pdf
    • http://atlaselitefitness.com/uploads/1/3/0/5/130552084/5631718.pdf
    • http://ancientartprovenance.com/uploads/1/3/0/8/130874129/6d3e720568.pdf
    • http://mastergamecraft.com/uploads/1/3/0/7/130775889/godes.pdf
    • http://the-wild-moon.com/uploads/1/3/0/4/130489800/7810881.pdf
    • http://scavenjer.com/uploads/1/3/0/5/130540420/5490246.pdf
    • http://bars4bitcoin.com/uploads/1/3/0/3/130379314/kewoferarevup_duwidozoso_kegunapadaxano_tumabamotiga.pdf
    • http://debzcabello.com/uploads/1/3/0/4/130483733/3064167.pdf
    • http://tripsrus2travel.net/uploads/1/3/0/6/130621686/jonifim.pdf
    • http://being-baylee.com/uploads/1/3/1/3/131384462/zavevojal.pdf
    • http://josephrossiter.com/uploads/1/3/0/3/130323601/0283c73e093e6ae.pdf
    • http://constructioncareerdaycc.org/uploads/1/3/0/7/130740351/nulezew.pdf
    • http://atlclimatestrike.org/uploads/1/3/0/2/130289474/fc162897.pdf
    • http://mylifedental.org/uploads/1/3/0/2/130288523/lugajetiserisik.pdf
    • http://alloexo.site/uploads/1/3/0/6/130639518/tavomekutevok_najurojemow_bavofuw.pdf
    • http://alloexo.site/upl
    • 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/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007bdd.bin
9a873edce75eb7e1c24b86ffec6870fad2d53e221a8c59a4f60727061a5b2ff2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BDD 9548 bytes

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