Malicious PDF — malware analysis report

Static analysis result for SHA-256 4815c8dfbd4fd7df…

MALICIOUS

PDF

37.4 KB Created: 2020-03-28 12:26:27 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 12b629f9c0d8d6e7e8bceee8f2dfb980 SHA-1: 13f852f1951b14979751e5c6e647be0b715c2ec3 SHA-256: 4815c8dfbd4fd7dfe06e872da5b9241e6f97ad837c108db78943fbcc7ca1d198
94 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to other PDF files hosted on similar domains. The document body suggests a lure related to a presentation, likely to trick users into visiting these malicious links. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a link farm designed to distribute traffic to numerous external 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://arianalarosa.com/uploads/1/3/0/8/130874409/130874409.html#programacion+lineal+entera+ppt
    • http://bikeworthy.com/uploads/1/3/0/2/130289652/wunorus-samiparal-bugedubirule.pdf
    • http://hostmaster.joannechampionconsultancy.com/uploads/1/3/0/5/130590496/zejegejugutevud-welesemeli-simemopomudo.pdf
    • http://ipoggioli.com/uploads/1/3/0/4/130435743/luziwamaledan.pdf
    • http://warrenbaker.org/uploads/1/3/0/8/130874480/8833501.pdf
    • http://wildcardwalks.com/uploads/1/3/0/9/130969090/6189129.pdf
    • http://coastalpoint.org/uploads/1/3/0/3/130323335/810e2187c0c69.pdf
    • http://ipfail.net/uploads/1/3/0/6/130621995/rosapiraremapuki.pdf
    • http://dumbhero.com/uploads/1/3/0/5/130543945/a1120b8.pdf
    • http://disruptionpartners.com/uploads/1/3/0/5/130590478/pamatevatadosokizuru.pdf
    • http://www.mytopfoundation.com/uploads/1/3/0/7/130738911/pikofovuk_guwapoloka_xefadumi_bubuzolez.pdf
    • http://rewardmotors.com/uploads/1/3/0/3/130324270/7bea4a2.pdf
    • http://sanowahyudiphotography.com/uploads/1/3/0/7/130776407/nogevasafa_sakulumesosuj_jogezafidiwe_konitubulap.pdf
    • http://newyoujewelryshop.com/uploads/1/3/0/6/130620293/f52f34ec1107866.pdf
    • http://cutestcabins.com/uploads/1/3/0/7/130739126/givomobadutunu_jizinowikila_felisadutezi_kigemasir.pdf
    • 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_off0000669b.bin
b946ebf1f2441bdd08c73d27fd042811ed3694317e6beabe925997cb850b0ded		 pdf-font-stream PDF embedded font (sfnt) at offset 0x669B 8916 bytes

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